---
product_id: 437241
title: "Kensington Expert Trackball Mouse (K64325), Black Silver, 5\"W x 5-3/4\"D x 2-1/2\"H"
brand: "kensington"
price: "97051CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Kensington"
url: https://www.desertcart.sn/products/437241-kensington-expert-trackball-mouse-k64325-black-silver-5w-x-5
store_origin: SN
region: Senegal
---

# Patented scroll ring 55mm large precision ball Customizable 4-button control Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H

**Brand:** kensington
**Price:** 97051CFA
**Availability:** ✅ In Stock

## Summary

> 🖱️ Elevate your desk game with precision, comfort, and control — don’t get left behind!

## Quick Answers

- **What is this?** Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H by kensington
- **How much does it cost?** 97051CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/437241-kensington-expert-trackball-mouse-k64325-black-silver-5w-x-5)

## Best For

- kensington enthusiasts

## Why This Product

- Trusted kensington brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tailored to Your Workflow:** Customize 4 buttons, scroll speed, and cursor speed with KensingtonKonnect software for ultimate productivity.
- • **Ambidextrous Design for All:** Perfectly balanced for left or right hand use, making it the go-to tool for diverse workspaces.
- • **Effortless Scrolling Mastery:** Patented scroll ring lets you breeze through long documents and web pages without lifting a finger.
- • **Ergonomic Comfort Revolution:** Detachable wrist rest supports your hand and wrist, reducing fatigue during marathon work sessions.
- • **Precision at Your Fingertips:** DiamondEye optical tracking on a large 55mm ball ensures pixel-perfect cursor control for demanding multitaskers.

## Overview

The Kensington Expert Trackball Mouse (K64325) combines a large 55mm ball with DiamondEye optical tracking for unmatched cursor precision. Featuring a patented scroll ring and customizable 4-button layout via KensingtonKonnect software, it offers ergonomic comfort with a detachable wrist rest and ambidextrous design. Wired USB-A connectivity ensures reliable performance, making it a top-ranked productivity tool trusted by professionals for over 20 years.

## Description

The Expert Mouse Wired Trackball is the ultimate productivity enhancer that makes working at the desk quicker, more accurate and extremely comfortable for your hand and wrist. Featuring DiamondEye technology, the trackball uses optical tracking to precisely follow small flecks embedded in the large 55mm ball to provide smooth, accurate cursor control. The four buttons are customizable using our highly intuitive KensingtonWorks software, while our award winning Scroll Ring lets you quickly scan up and down web pages and large documents. Add it all up and you get exceptional comfort and ease-of-use that has set the industry standard for more than 20 years.

Review: The best trackball on the market - Once, many many years ago, I went over to my friends house and was amazed and very curious about an input device he had plugged into his computer in lieu of a traditional mouse. Ever since then, I've wanted to try out a trackball but never did. Recently I've been using my computer from my bed, my keyboard on my lap, my mouse to my side. This position wasn't that efficient for mouse use, the mouse wanted to slide towards me so i had to put some books under the mouse pad in a very ghetto setup, and prolonged use from that position made my shoulder sore. I decided I would try out a trackball and see if that was better. I did my research and it looked like the kensington expert was exactly what i wanted: a large ball you control with your fingers not your thumb, multiple buttons, had a scroll wheel, the price was decent, it got good reviews, and most importantly looked awesome. And it relieved my sore shoulder. This trackball was everything I was hoping for. - The ball is very large and allow precise movements, which was my primary interest when looking at all the trackballs on the market. I tried out the extremely popular logitech thumb trackball and the thumb movement wasn't for me, it's imprecise and made me sea sick in FPS games. The ball is pretty heavy but once you break it in (ie cover the ball in hand oil) the ball rotates very smoothly and doesn't stick. - The two extra buttons are invaluable. After using a mouse with 2 extra buttons, it would be hard to go back to a mouse with only left and right click. The buttons on this trackball are huge and do take a bit of getting used to. Left clicking with your thumb becomes second nature after a bit of use, but the two upper buttons are more difficult to reach and for me, it took me quite a while to press the upper buttons when I needed to without really consciously thinking about it. Once you get used to it it's pretty awesome though. A word of warning if you enjoying gaming though: moving the cursor + clicking the upper two buttons is kinda difficult, with the upper left button being near impossible (when using your right hand; left hand vice versa). This is probably the worst thing about trackballs in general: you're controlling the cursor with your fingers instead of your hand movement. In order to have smooth cursor movement, it's difficult to press harder to reach buttons or press multiple buttons simultaneously. This negative isn't a deal breaker for me, but it is something to keep in mind. This trackball's software enables button chording (pressing the two lower or two upper buttons simultaneously for a third input [ie press left + right click at the same time to get middle click]) but I hate the software so I can't use it. More on that in the tips n tricks section below. - This trackball has a scroll wheel. It's not bad but I'm not 100% happy with it. The scroll wheel works fine, it scrolls exactly when it's supposed to and it doesn't feel terrible, but sometimes (maybe it's just mine) the wheel doesn't feel very solidly in there, it has a bit of jiggle, but it only feels that way sometimes. In addition the "grating sand" texture isn't amazing but it's not bad. I thought I would dislike it a hell of a lot more after reading all those bad reviews. The scroll wheel isn't bad, it's not enough to drop my review down a star, but I wouldn't say I love it either. - Trackballs are pretty expensive, it seems like they either fall into the overpriced and crappy category, or the overpriced and good category. This trackball falls into the latter. Compared to other trackballs or similar price I would say this is a pretty good value. At the time of this writing, $70 is pretty dang amazing (I bought it for $75). ___ Here are some miscellaneous tips n tricks about my experience with this trackball: * The software that you can download from the kensington website, trackballworks, is the worst piece of crap. Mouseworks or whatever the previous version was called I hear was significantly better and allowed a lot of customization, but sadly it doesn't work past windows XP. The feature I was talking about earlier, chording, is useless if you game AT ALL. The way chording works in this software is thusly: You press a button, but before the input for that button goes through, the software waits about half a second to see if you're going to press another button. This works ok outside of games where you rarely push two mouse buttons at the same time. I thought "oh ok I'll just turn the feature off." NOPE. Even if you don't assign anything to the chord input, there's still a half second delay, AND if you do push both buttons simultaneously, instead of sending both buttons inputs like you would expect, it sends NO INPUT. This effectively makes the software worse than useless for gaming. I called kensington support about this issue I was having and their answer was "that's just a limitation of the software, there's nothing you can do." So I thought "ok I'll just close the software" but for some reason that completely screwed up the scroll wheel, making it act weird as hell. After a few days I had the thought to uninstall the software which disabled chording and restored the scroll wheel's function. If you game, don't install the terrible software. * If you don't install the software but still want to assign different inputs to the buttons than the defaults (left click, right click, button 4, middle click, going counterclockwise from the bottom left button) then install x-mouse button control. I found that program searching for an answer to my question with trackball works. x-mouse button control is amazing, you can assign whatever inputs you want to the buttons, and even have each button do a different thing depending on the program you're in. Just pretend x-mouse button control is the software that comes with this trackball and never look back. * For those of you who are concerned about the reviews talking about the ball sticking, don't worry, after a little use it loosens up. For very precise movements, if the ball is stiff, it won't move at all until you reach a certain level of force, then it will suddenly unstick and the cursor will move way further than you intended. If this is happening, just use the trackball for a few hours and eventually the ball will be coated in natural hand oils. If it becomes smooth and then starts sticking again, trying cleaning the metal contact points the ball rests on with a bit of rubbing alcohol, this always makes the ball roll super smooth again for me. And here's something I recently found out: microfiber cloths are amazing. Wiping the ball for a few seconds with a microfiber cloth made the ball roll like new again and prevents sticking for days/weeks. * This trackball was uncomfortable to me at first. My hand didn't know how to properly use it and my wrist would get sore. After just a few days of heavy use, it became waaay more comfortable to use. It's all about how used to it you are. Don't listen to the negative reviews saying how uncomfortable this trackball is, all trackballs are more ergonomic than mice, and this one is no exception. This is by far the longest review I've written for an desertcart purchase but this trackball deserves it. I love this thing. Do your research and buy the trackball you think is best for you, but if you do end up buying this one you won't be disappointed.
Review: Computer navigation the way it should be! - After having read several reviews around the web and being aware of the potential downsides as well as the upsides, I decided to buy myself one of these. Boy, am I glad I did. Admittedly, I'm the kind of person who's not satisfied with the typical mousing solution (I have really big hands and I do a lot of delicate work) and likes to try new things, so if that's not you then you may want to try one out before you buy if possible, or at least get one with a return policy. Caveat emptor. That being said, short of building a custom one myself, the Kensington Expert Mouse is pretty much what I want in a trackball, and having used it for awhile any regular mouse feels foreign and less-than-intuitive. First, the cons, in order of greatest to least issue (and they're all minor issues to me anyway). :: It does have a bit of a backward slope to it, probably about 10-15 degrees, which my large hands and already-tilted desk find mildly awkward. If you have a desk that's fairly high above your lap, then that backward slant will probably match the angle your arms are already at and this won't be an issue. :: The scroll wheel, as has been mentioned elsewhere, does feel a little scratchy, like a plastic-on-plastic sort of texture. It's not quite the buttery-smooth, gliding motion you expect after using the ball itself (more on that later) - it feels more like the back of a plastic spoon sliding across a Formica counter. That said, mine wasn't that bad, and probably would go away with a bit of silicone oil, but other reviews range from "not a problem at all" to "nasty-feeling deal breaker" so I suspect that Kensington's quality control could use a bit of tightening up. Again, get one with a return policy in case you don't like it. Common sense. I find myself using the scroll wheel less than I would otherwise anyway, as I've mapped one of the buttons to middle-click and I use that in web browsers to scroll up and down by moving the cursor. Smoother and easier than the scroll wheel. :: Occasionally, a button click won't register if you press the button on the corner or edge - you have to get closer to the middle. Rarely an issue unless I'm gaming, because my hands have a large span and I may physically miss the button at a critical moment when I'm not paying attention. It'll come with practice, I'm sure, just something to be aware of if you have palm-a-basketball-sized hands like me. Now, to the pros! Whee! :: Yes, it's got a pretty big footprint - it's about 5.5" by 9" with the included stiff-foam wrist rest (which I do recommend using, because of the aforementioned back angle) - but it doesn't move around. It takes up about 60% of the desk space that you'd dedicate to a typical mouse pad. Especially on those pull-out keyboard trays, there isn't enough room to use a mouse, but since the Kensington Expert trackball is under six inches wide it'll fit in a nice little rectangle next to the keyboard. Height is another matter, since the ball itself sticks out pretty high, but I don't personally find it to be too much of an issue. YMMV. :: The four large, programmable buttons. I'm not a lefty, but I mouse left-handed, so being able to map the buttons to essentially whatever I want with Kensington's free software is absolutely a blessing. In addition, different people will prefer to use different fingers for tasks of varying frequency, so whereas I don't right-click much and map it to where my ring finger sits, someone else may put it under their index finger or thumb. The software in general is pretty easy to use, and has enough functionality to feel nicely customizable without being so in-depth that only an advanced power user can take advantage of its potential. :: The trackball. Oh, that trackball. Smoother than a greased Fonzie on a Teflon-coated ice rink. Right out of the package it actually feels slightly rough or not as free-spinning, because the ball and its three contact points are completely pristine. Once you get some skin oils on it through use, it's like buttah. Gross-sounding, I know, but pretty much everything you touch gets skin oil on it. Speaking of which, the ball is just dropped into its socket, so to clean out the inevitable gunk that will accumulate in any trackball assembly you just have to turn it upside down and the ball falls out. No disassembly required. The inside of the socket is smooth plastic, so you just wipe it out and get back to work. The ball itself has a nice bit of weight to it, and is positively pleasurable to the hands in use. It's got a solid feel and has some inertia when you move it, which brings me to the next point... :: It has an infinite range of very smooth motion. I currently have a dual-monitor setup, and (besides being very awkward and un-ergonomic) I despise having to pick up a mouse, move it back to the other side of my mouse pad and continue my motion across the screen. DESPISSSSSE. It makes my fingers recoil just thinking about it... Ahem. Anyways. A quick flick of the ball will send the cursor moving across the screen, and the ball's inertia will continue the motion. It doesn't jump around or go crazy, it just follows the ball like it's supposed to. I have the acceleration parameter in the software set to maximum, so a fast motion of the ball will cover lots of ground quickly, but slow motions will still allow fine, precise positioning of the mouse. This becomes an even greater blessing with triple- or quad-monitor setups, and once again, this trackball takes up less desk space than an ordinary mouse. You don't have to have a huge screen to need this, either... for extra-fine work like Photoshop or video editing, you may want to slow the cursor speed down, which effectively makes the screen much larger relative to the motion of the mouse. There is no picking up and putting down with the Kensington Expert trackball - you just keep rolling. If you're not there yet... keep rolling. It feels natural, the way navigating a computer should. So, to sum it all up, I guess I could say that I love my Kensington Expert Mouse because it feels right. It's intuitive to use, customizable, ergonomic, and it just works. There are a couple little niggles, but in my humble opinion they are far outweighed by how they make my computing experience easier and more natural. Because everyone has different needs for their computing experience, not everyone will want or need one of these. If I was just an occasional casual computer user that isn't concerned with ergonomics or ease of use, I would absolutely think twice about spending $75 on a mouse I'm not sure I'll like when the one I have mostly does what I need it to. But that's probably not Kensington's primary market here. For me, and people like me, it's worth the money to make my interface with my computer feel good, because I use it every day.

## Features

- Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with ease
- Detachable, ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous design
- Customizable 4-button design, scroll speed and cursor speed via *KensingtonKonnect software. *Windows ARM-based computers are currently not supported. Please check back for future updates on compatibility
- ChromeOS user can get HID functions for a trackball but will not be able to customize their device through KensingtonKonnect.
- Wired USB-A connection for reliable connectivity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00009KH63 |
| Additional Features | Ergonomic Design |
| Antenna Location | Office |
| Best Sellers Rank | #3 in Computer Trackballs |
| Brand | Kensington |
| Button Quantity | 3 |
| Color | Black Silver |
| Compatible Devices | Surface Laptop 1st Edition 13", Windows 7, Windows 8, Windows 8.1, macOS 10.8, Windows 10, macOS X 10.11, macOS 10.10 or above, Chrome OS 44 or above, macOS 10.9, macOS Sierra 10.12, macOS 10.13 or above |
| Connectivity Technology | USB |
| Customer Reviews | 4.3 out of 5 stars 4,485 Reviews |
| Embellishment Feature | Crystal |
| Enclosure Material | Plastic |
| Finish | Matte |
| Global Trade Identification Number | 00085896643258, 50085896643253 |
| Hand Orientation | Ambidextrous |
| Hardware Platform | PC |
| Included Components | Detachable Wrist Rest, Kensington Trackball 4-Button Usb Expert Mouse |
| Item Dimensions L x W | 9.75"L x 3.5"W |
| Item Part Number | 64325 |
| Item Weight | 0.34 kg |
| Manufacturer | Kensington |
| Mfr Part Number | 64325 |
| Minimum Required Operating System Version | Windows 7 |
| Model Name | K64325 |
| Model Number | 64325 |
| Movement Detection | Optical |
| Movement Detection Technology | Optical |
| Number of Batteries | 1 12V batteries required. (included) |
| Number of Buttons | 3 |
| Operating System | Windows 10, Windows 7 |
| Pattern | Mouse |
| Power Source | Corded Electric |
| Range | feet |
| Special Feature | Ergonomic Design |
| Style Name | Wired |
| UPC | 638458744902 085896643258 809385141014 666669843022 803982736673 |
| Unit Count | 1 Count |
| Warranty Description | 5 Year Warranty |

## Product Details

- **Brand:** Kensington
- **Color:** Black Silver
- **Connectivity Technology:** USB
- **Movement Detection Technology:** Optical
- **Special Feature:** Ergonomic Design

## Images

![Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H - Image 1](https://m.media-amazon.com/images/I/51-OPm54iKL.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: Does it work on Linux?**
A: Yes. I’ve used this trackball with 5 different releases of Linux Mint going back some years. All 4 buttons will work, but you will have to monkey with your desktop environment to map them to what you want.

**Q: does left click result in double click after use?**
A: I have a Kensington "Mouse Port/Serial" version (RS232 "COM" Serial or PS/2) Expert Mouse trackball (from the mid 90's) that I bought new all those years ago when I built my Intel 486 DX2-66 PC (66Mhz = 0.066Ghz) and have been using for hours and hours every day on each PC upgrade I've built ever since (currently a i7-4790K !), including audio editing, gaming, web browsing, and more...  I still have the original box which says "OS2 Warp" and "Works with Windows 95 and Windows 3.1" and "5 Year Warranty" on it (yes, it's really THAT old!) and all these years later I'm now using it on a 4.0Ghz quad-core PC running Windows 10 Pro x64 with no problems whatsoever! Even after pounding hard on the bottom left button for gaming year after year it just took the abuse and kept on working fine. After about 15 years of that abuse along with lots of hard pressure holding of that same bottom left button for selecting audio segments, manually scrolling through documents and web pages, and so on, it began occasionally either releasing or double-clicking during selecting of audio segments as if I'd released the button when I had not, BUT after sitting overnight it always goes back to normal and doesn't act up like that unless I start doing lots of heavy thumb action with bottom left button holding or pounding again. If I remember to go a little easier on the pressing or don't do a ton of left button holds it can go for weeks before the bottom left button gets quirky again. Also note that it's literally 20 years old, it's been doing that off and on for about a decade now, and it has never been anywhere near as intermittent and downright useless as the Logitech buttons become in less than a year with comparable use. We have Logitech trackballs at work and after the third replacement batch in 2 years they've learned to live with the flaky buttons because the boss feels that $25-$40 for a mouse is absurd and he definitely won't spend the money to buy Kensington trackballs... I'm actually about to replace my 20 year old Kensington Expert Mouse with the new model, only because I need a KVM, my back-lit keyboard is "USB only" (PS/2 Support), USB didn't exist when I bought my now 20 year old Serial/PS-2 Expert Mouse, and although I have successfully gotten its' signals to convert to USB through a (RS-232 COM Port) "Serial to USB interface" and also got a PS/2 to USB keyboard/mouse signal converter dongle to work with it I haven't been able to successfully get either of those converted USB signals to pass through a USB KVM...I started to look for other ways to adapt PS/2 or Serial to USB that claimed to be KVM compatible but I couldn't find a workable solution that would pass through a USB KVM for less than the cost of a brand new Kensington USB Expert Mouse so sadly I think my 20 year old Expert Mouse is about to be retired and an new USB one will finally be taking its' place soon. I hope the quality of today's Kensington Expert Mouse is as good as they were 20 years ago. Time will tell... Also note that my 20 year old Expert Mouse that still works very well uses 2 giant wide metal rollers for the X and Y axis motion detection (that the ball rests on) with photo-led sensor wheels inside to generate the X/Y mouse movement signals, basically over-sized industrial grade versions of the small plastic roller rods the old rubber ball mice used to use (which had to be cleaned when the cursor started getting stuck and I need to clean these maybe once every 3-4 years at the most), unlike the much newer mouse technology of the past decade that uses optical detectors to actually look at the ball and see it move. As a comparison, Logitech once offered a big track ball mouse for a while that looked almost identical to the Kensington Expert Mouse for less than half the price and when I lifted the ball out to check out the rollers it was immediately obvious why the price was so much less.  They were tiny rollers just like you'd find inside a cheap old ball mouse! So 20 years ago you got what you paid for, and even 10 years ago it was obvious that the Kensington products were still vastly superior in quality to their competition and based on the reviews here that still seems to be the case.

**Q: Can the Expert side scroll?  I use spreadsheets that are really wide and have a lot of columns and need that feature.**
A: Even better than holding the SHIFT key, you can scroll horizontally ONE-HANDED: Assign one of the additional buttons to activate the SHIFT key using the included KENSINGTON TRACKBALL WORKS software. I recommend using the button opposite your thumb so you can use your thumb to scroll horizontally. So, for those RIGHT-handed assign SHIFT to the TOP RIGHT button, for LEFT-handed assign SHIFT to the TOP LEFT button. This works on Windows and Mac OS X.More Info: http://www.kensington.com/us/us/6498/trackballworks%e2%84%a2-customization-software

**Q: Does the scroll ring on this mouse have clicks that you can feel while scrolling - when scrolling through a set of images to be able to know that you**
A: No, I don't know if the people above had a different version of the mouse or something but there are NO clicks on the scroll ring. It scrolls smoothly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The best trackball on the market
*by M***N on July 6, 2014*

Once, many many years ago, I went over to my friends house and was amazed and very curious about an input device he had plugged into his computer in lieu of a traditional mouse. Ever since then, I've wanted to try out a trackball but never did. Recently I've been using my computer from my bed, my keyboard on my lap, my mouse to my side. This position wasn't that efficient for mouse use, the mouse wanted to slide towards me so i had to put some books under the mouse pad in a very ghetto setup, and prolonged use from that position made my shoulder sore. I decided I would try out a trackball and see if that was better. I did my research and it looked like the kensington expert was exactly what i wanted: a large ball you control with your fingers not your thumb, multiple buttons, had a scroll wheel, the price was decent, it got good reviews, and most importantly looked awesome. And it relieved my sore shoulder. This trackball was everything I was hoping for. - The ball is very large and allow precise movements, which was my primary interest when looking at all the trackballs on the market. I tried out the extremely popular logitech thumb trackball and the thumb movement wasn't for me, it's imprecise and made me sea sick in FPS games. The ball is pretty heavy but once you break it in (ie cover the ball in hand oil) the ball rotates very smoothly and doesn't stick. - The two extra buttons are invaluable. After using a mouse with 2 extra buttons, it would be hard to go back to a mouse with only left and right click. The buttons on this trackball are huge and do take a bit of getting used to. Left clicking with your thumb becomes second nature after a bit of use, but the two upper buttons are more difficult to reach and for me, it took me quite a while to press the upper buttons when I needed to without really consciously thinking about it. Once you get used to it it's pretty awesome though. A word of warning if you enjoying gaming though: moving the cursor + clicking the upper two buttons is kinda difficult, with the upper left button being near impossible (when using your right hand; left hand vice versa). This is probably the worst thing about trackballs in general: you're controlling the cursor with your fingers instead of your hand movement. In order to have smooth cursor movement, it's difficult to press harder to reach buttons or press multiple buttons simultaneously. This negative isn't a deal breaker for me, but it is something to keep in mind. This trackball's software enables button chording (pressing the two lower or two upper buttons simultaneously for a third input [ie press left + right click at the same time to get middle click]) but I hate the software so I can't use it. More on that in the tips n tricks section below. - This trackball has a scroll wheel. It's not bad but I'm not 100% happy with it. The scroll wheel works fine, it scrolls exactly when it's supposed to and it doesn't feel terrible, but sometimes (maybe it's just mine) the wheel doesn't feel very solidly in there, it has a bit of jiggle, but it only feels that way sometimes. In addition the "grating sand" texture isn't amazing but it's not bad. I thought I would dislike it a hell of a lot more after reading all those bad reviews. The scroll wheel isn't bad, it's not enough to drop my review down a star, but I wouldn't say I love it either. - Trackballs are pretty expensive, it seems like they either fall into the overpriced and crappy category, or the overpriced and good category. This trackball falls into the latter. Compared to other trackballs or similar price I would say this is a pretty good value. At the time of this writing, $70 is pretty dang amazing (I bought it for $75). ___ Here are some miscellaneous tips n tricks about my experience with this trackball: * The software that you can download from the kensington website, trackballworks, is the worst piece of crap. Mouseworks or whatever the previous version was called I hear was significantly better and allowed a lot of customization, but sadly it doesn't work past windows XP. The feature I was talking about earlier, chording, is useless if you game AT ALL. The way chording works in this software is thusly: You press a button, but before the input for that button goes through, the software waits about half a second to see if you're going to press another button. This works ok outside of games where you rarely push two mouse buttons at the same time. I thought "oh ok I'll just turn the feature off." NOPE. Even if you don't assign anything to the chord input, there's still a half second delay, AND if you do push both buttons simultaneously, instead of sending both buttons inputs like you would expect, it sends NO INPUT. This effectively makes the software worse than useless for gaming. I called kensington support about this issue I was having and their answer was "that's just a limitation of the software, there's nothing you can do." So I thought "ok I'll just close the software" but for some reason that completely screwed up the scroll wheel, making it act weird as hell. After a few days I had the thought to uninstall the software which disabled chording and restored the scroll wheel's function. If you game, don't install the terrible software. * If you don't install the software but still want to assign different inputs to the buttons than the defaults (left click, right click, button 4, middle click, going counterclockwise from the bottom left button) then install x-mouse button control. I found that program searching for an answer to my question with trackball works. x-mouse button control is amazing, you can assign whatever inputs you want to the buttons, and even have each button do a different thing depending on the program you're in. Just pretend x-mouse button control is the software that comes with this trackball and never look back. * For those of you who are concerned about the reviews talking about the ball sticking, don't worry, after a little use it loosens up. For very precise movements, if the ball is stiff, it won't move at all until you reach a certain level of force, then it will suddenly unstick and the cursor will move way further than you intended. If this is happening, just use the trackball for a few hours and eventually the ball will be coated in natural hand oils. If it becomes smooth and then starts sticking again, trying cleaning the metal contact points the ball rests on with a bit of rubbing alcohol, this always makes the ball roll super smooth again for me. And here's something I recently found out: microfiber cloths are amazing. Wiping the ball for a few seconds with a microfiber cloth made the ball roll like new again and prevents sticking for days/weeks. * This trackball was uncomfortable to me at first. My hand didn't know how to properly use it and my wrist would get sore. After just a few days of heavy use, it became waaay more comfortable to use. It's all about how used to it you are. Don't listen to the negative reviews saying how uncomfortable this trackball is, all trackballs are more ergonomic than mice, and this one is no exception. This is by far the longest review I've written for an amazon purchase but this trackball deserves it. I love this thing. Do your research and buy the trackball you think is best for you, but if you do end up buying this one you won't be disappointed.

### ⭐⭐⭐⭐⭐ Computer navigation the way it should be!
*by J***S on January 31, 2014*

After having read several reviews around the web and being aware of the potential downsides as well as the upsides, I decided to buy myself one of these. Boy, am I glad I did. Admittedly, I'm the kind of person who's not satisfied with the typical mousing solution (I have really big hands and I do a lot of delicate work) and likes to try new things, so if that's not you then you may want to try one out before you buy if possible, or at least get one with a return policy. Caveat emptor. That being said, short of building a custom one myself, the Kensington Expert Mouse is pretty much what I want in a trackball, and having used it for awhile any regular mouse feels foreign and less-than-intuitive. First, the cons, in order of greatest to least issue (and they're all minor issues to me anyway). :: It does have a bit of a backward slope to it, probably about 10-15 degrees, which my large hands and already-tilted desk find mildly awkward. If you have a desk that's fairly high above your lap, then that backward slant will probably match the angle your arms are already at and this won't be an issue. :: The scroll wheel, as has been mentioned elsewhere, does feel a little scratchy, like a plastic-on-plastic sort of texture. It's not quite the buttery-smooth, gliding motion you expect after using the ball itself (more on that later) - it feels more like the back of a plastic spoon sliding across a Formica counter. That said, mine wasn't that bad, and probably would go away with a bit of silicone oil, but other reviews range from "not a problem at all" to "nasty-feeling deal breaker" so I suspect that Kensington's quality control could use a bit of tightening up. Again, get one with a return policy in case you don't like it. Common sense. I find myself using the scroll wheel less than I would otherwise anyway, as I've mapped one of the buttons to middle-click and I use that in web browsers to scroll up and down by moving the cursor. Smoother and easier than the scroll wheel. :: Occasionally, a button click won't register if you press the button on the corner or edge - you have to get closer to the middle. Rarely an issue unless I'm gaming, because my hands have a large span and I may physically miss the button at a critical moment when I'm not paying attention. It'll come with practice, I'm sure, just something to be aware of if you have palm-a-basketball-sized hands like me. Now, to the pros! Whee! :: Yes, it's got a pretty big footprint - it's about 5.5" by 9" with the included stiff-foam wrist rest (which I do recommend using, because of the aforementioned back angle) - but it doesn't move around. It takes up about 60% of the desk space that you'd dedicate to a typical mouse pad. Especially on those pull-out keyboard trays, there isn't enough room to use a mouse, but since the Kensington Expert trackball is under six inches wide it'll fit in a nice little rectangle next to the keyboard. Height is another matter, since the ball itself sticks out pretty high, but I don't personally find it to be too much of an issue. YMMV. :: The four large, programmable buttons. I'm not a lefty, but I mouse left-handed, so being able to map the buttons to essentially whatever I want with Kensington's free software is absolutely a blessing. In addition, different people will prefer to use different fingers for tasks of varying frequency, so whereas I don't right-click much and map it to where my ring finger sits, someone else may put it under their index finger or thumb. The software in general is pretty easy to use, and has enough functionality to feel nicely customizable without being so in-depth that only an advanced power user can take advantage of its potential. :: The trackball. Oh, that trackball. Smoother than a greased Fonzie on a Teflon-coated ice rink. Right out of the package it actually feels slightly rough or not as free-spinning, because the ball and its three contact points are completely pristine. Once you get some skin oils on it through use, it's like buttah. Gross-sounding, I know, but pretty much everything you touch gets skin oil on it. Speaking of which, the ball is just dropped into its socket, so to clean out the inevitable gunk that will accumulate in any trackball assembly you just have to turn it upside down and the ball falls out. No disassembly required. The inside of the socket is smooth plastic, so you just wipe it out and get back to work. The ball itself has a nice bit of weight to it, and is positively pleasurable to the hands in use. It's got a solid feel and has some inertia when you move it, which brings me to the next point... :: It has an infinite range of very smooth motion. I currently have a dual-monitor setup, and (besides being very awkward and un-ergonomic) I despise having to pick up a mouse, move it back to the other side of my mouse pad and continue my motion across the screen. DESPISSSSSE. It makes my fingers recoil just thinking about it... Ahem. Anyways. A quick flick of the ball will send the cursor moving across the screen, and the ball's inertia will continue the motion. It doesn't jump around or go crazy, it just follows the ball like it's supposed to. I have the acceleration parameter in the software set to maximum, so a fast motion of the ball will cover lots of ground quickly, but slow motions will still allow fine, precise positioning of the mouse. This becomes an even greater blessing with triple- or quad-monitor setups, and once again, this trackball takes up less desk space than an ordinary mouse. You don't have to have a huge screen to need this, either... for extra-fine work like Photoshop or video editing, you may want to slow the cursor speed down, which effectively makes the screen much larger relative to the motion of the mouse. There is no picking up and putting down with the Kensington Expert trackball - you just keep rolling. If you're not there yet... keep rolling. It feels natural, the way navigating a computer should. So, to sum it all up, I guess I could say that I love my Kensington Expert Mouse because it feels right. It's intuitive to use, customizable, ergonomic, and it just works. There are a couple little niggles, but in my humble opinion they are far outweighed by how they make my computing experience easier and more natural. Because everyone has different needs for their computing experience, not everyone will want or need one of these. If I was just an occasional casual computer user that isn't concerned with ergonomics or ease of use, I would absolutely think twice about spending $75 on a mouse I'm not sure I'll like when the one I have mostly does what I need it to. But that's probably not Kensington's primary market here. For me, and people like me, it's worth the money to make my interface with my computer feel good, because I use it every day.

### ⭐⭐⭐⭐⭐ This trackball still reigns supreme.
*by D***E on February 4, 2011*

I have written a complete review of this device in its Wireless Version which is no longer manufactured. Its overall design has been well described in these numerous reviews. I would like to address a few of the complaints registered in some of the reviews on this thread, at least IMHO: 1) The bearings on which the ball rests are different, and overall, there is no significant change in build quality which is more than adequate. 2) Initially I also had some difficulty on Win7/64 with Trackball Works 1.04 and 1.01, the European version which tech support recommends when you call in to complain about the former. In my case, this represented some sort of software conflict which was no longer the case when I gave it another try after having had to reformat and reinstall my system for other reasons. Initially, although I could program the trackball without difficulty, it would intermittently hang, or my computer would crash. Since the reinstall, now for about 3 months use, Version 1.04 works absolutely fine with this Expert Mouse, but install the software before connecting the device, as mentioned. Absolutely NONE of the initial problems have recurred. Trackball Works has some problems with complete programming of the Slimblade Trackball version and Kensington is working on it, with a supposed upgrade to the software due in March, at least at the time of this writing. 3) The ergonomic issues raised by some of the reviewers are legitimate, but it depends a great deal on the individual user. I agree that the "wrist rest" supplied is not a very successful solution. Some will prefer the flatter format of the Slimblade, but I don't think the four buttons work as smoothly as those on the Expert, and are very dependent on where you place your fingers on them, which is not the case with the latter which are nicely designed. At work, I use this trackball for hours on end, now for years, in our radiology department, scrolling through images, and have had absolutely no wrist or finger pain. One of the tricks is to operate the mouse with your hand canted to the right at about a 30 degree angle which helps to obviate more extreme wrist extension. Give your hand and wrist a brief rest by changing position every few minutes which can easily be done automatically during the workflow since you aren't gripping something. Any pointing device without rest will be a nuisance. For those who are particularly sensitive, place a small bean bag place under the palm of the hand, not the wrist. Since you aren't spatially moving the unit, it is not intrusive, if you buy a proper sized bag. 4) Complaints about the scroll ring, IMHO, are entirely unjustified. It works very well. I have had no problems with its function on this unit, my previous wireless mouse, or any in our Department at work. 5) Complaints about the ball's being sticky and insensitive are also groundless, IMHO. You will find slight "newness", reflected in slight stiffness,when you first use the unit. This will clear promptly, and even more quickly if you just spin the ball for a couple of minutes with moderate downward pressure to break in the interface between the support pins and the ball. Periodically clean the ball with a little soap and water, then alcohol to restore a smooth surface, and repeat the conditioning routine, in an abbreviated form. At the same time, inspect the pins on which the ball rests for accummulated dust and debris, and make sure they're absolutely clean. Works like a charm. For those that don't like the scroll wheel, try the Slimblade where scrolling is done via the ball itself, turned transversely. That works well....it's just a matter of personal preference. I personally prefer the larger ball on the Expert versus the Slimblade, and the independent scroll wheel. The interface cable on the Slimblade is a little more robust and less prone to kinking if you move the trackball around quite a bit, for example, if you're also using a graphics tablet on which you seat the trackball. In any case, I don't think it's an issue, particularly if you take a bit a care of how you set the mouse down so that it isn't repetitively stressed with a kink. BTW, I couldn't find the magnet that one reviewer talked about at the bottom of the receiver for the ball. All that's there is the optical pickup. BTW, if you use the Intuous 4 Wacom tablet, the RF mouse they supply is greatly improved over previously, and is nicely programmable, except for no control over acceleration which some users may find a distinct negative. Bottom line: HIGHLY recommended after years of experience using this trackball. Works perfectly well with Win 7/64.

## Frequently Bought Together

- Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H
- Kensington Orbit Trackball Mouse with Scroll Ring (K75327WW), Black-Grey
- Kensington Pro Fit Ergonomic Wired Keyboard- Black (K75400US)

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