KOIOS Air Purifiers for Bedroom Home, H13 True HEPA Filter Air Purifiers for Desktop Office Car Pets with USB Cable, Small Air Cleaner, Night Light, Timer, Remove Smoke, Dust, Odors, Pollen

I chose this air "purifier" for a simple reason: it uses pretty generic air filters. As long as you can get the air filters (and there seems to be plenty of them on Amazon and elsewhere, for reasonable prices), these will work fine, as it is basically a simple fan pumping dirty air through the filter. And that, it does a pretty good job, with multiple levels of fan power (and noise). The size is pretty small, and doesn't look obviously like an air purifier. The lights indicating power level is pretty low-profile. Though one questions why there's a leather-strap / carry handle on the side. It is powered by a USB-C plug drawing less than an amp even at max power. (Power brick and cable NOT included) There is no air quality indicator or fancy features like that, which is why these purifiers are cheap, with the differences mainly in case design. Twist the bottom to reveal the filter compartment. All in all, simple small capacity air purifier for low price, exactly what's asked for.

It’s a great size. It’s quiet. It’s very nice that you can plug it into your car and it works very well. The only con is that you have to turn it on every time you start your car and I forget way too often to do so.

We bought this air purifier for the laundry room where we keep the cat's litter box. It works surprisingly well to control orders and keeps the air fresh. It's small and compact, quite running and easy to set up. The reason I gave it 4 stars was the USB plug with no charger block. It seems like this would have been an inexpensive addition. Also, make sure you order the correct size replacement filter. It uses H13 compatible with P40 air purifiers. We installed 7 weeks ago and plan to change every 3 months. So far, so good.

Great for the office. Not loud. Worth the price.

Update a few months later... This plus the larger purifier worked great together until this one just didn't. I hated that the only way you knew it was time to change the filter was that suddenly your entire space smelled like what you were trying to get rid of, causing the other purifier to have to do double duty. After a few filter changes though (a few months), the only way to get rid of the smoke smell was to completely unplug this unit, even when it has a brand new filter. Not sure what's up with the design on the inside, but something in it was absorbing everything around it and spewing it back out constantly. Unplug the unit, smell goes away. It's in the trash now. Original... I bought this plus another larger air purifier to deal with smoking in what is a roughly 1200sf open space with 12 foot ceilings. Not sure how either works separately, but together they work really well. This one is really quiet, but it does have a blue light that reflects really hard on surfaces. I haven't read the instructions enough to see if it can be turned off and just turned it around so it's not as bothersome. The size is great for sitting on a night stand. Very easy to set up.