O2Ring-S Oxygen Monitor with Vibration Reminder, Bluetooth Pulse Oximeter Tracks SPO2 and Pulse Rate, 24 hrs Battery Life, 4*10 Hours Built-in Memory, Rechargeable Pulse Ox with Free PC & APP

FANTASTIC! The Wellue O2 Ring Monitor provides the data I always wanted but never got as a longtime Oura Ring owner. The Wellue tracks AND RECORDS every 6 seconds providing REAL-TIME & useful daily, weekly & monthly detailed data on Oxygen AND Sleep. The ring can be comfortably worn on any finger or thumb and automatically starts a recording session when put on. A visible LED can easily be read ON THE RING, itself. In the morning, when removing the ring, the LED indicates it’s “saving” & plugging in the standard USB-C charging cable automatically initiates download of data to the app, making your night’s session data immediately available! Really quite incredible from a technical, functional and efficiency perspective to have something so powerful, work so easily. *A super useful feature is the ability to set a lower threshold for O2 and the ring will vibrate & wake you if your oxygen level decreases to that level. +Pros: no sizing required, no special charger, works automatically & provides A LOT of valuable information in an easy to use app. -Cons: a bit bulky for daytime wear but easily doable. (See pic next to Oura) HIGHLY RECOMMEND

I was initially very skeptical about this device. However, after my wife experienced a very frightening issue one night with her oxygen machine, I decided to give it a try — and I’m very glad I did. My wife now wears this ring every night to ensure she is always receiving the oxygen she needs. If her oxygen level drops below the threshold I set, the device vibrates and immediately sends a loud alert to my iPhone. That feature alone provides tremendous peace of mind. She has worn this device during hospital stays and doctor visits. Of course, the hospitals use their own professional monitoring equipment, but every time I compared the readings, this device was remarkably accurate and matched the hospital equipment almost exactly. The included app is easy to use and works very well. It alerts you if you move too far away from the device, and the connection remains solid throughout our fairly large house. The app also stores historical readings, which can be downloaded and shared with doctors when needed. Battery life has also been excellent. We typically get around 16–20 hours per charge. We simply charge it for a couple of hours each day, and it’s ready to go again. Many healthcare professionals who have seen this device have been highly impressed with it. Surprisingly, most had never heard of it before. After about six months of near-constant use, we did experience a small mechanical issue where the device occasionally slipped off my wife’s finger. I contacted customer service, and within a week they had sent a brand-new replacement device — no arguments, no blame, and no hassle. They were friendly, responsive, and extremely easy to work with. If you’re hesitant or skeptical about buying this device, don’t be. For anyone who needs to monitor oxygen levels — either for themselves or for someone they love — this is one of the best and most reassuring little devices you can own. The product itself is excellent, and the customer service fully backed it up.

I am updating my review. This O2Ring-S monitor constantly fails to download the stored information to my laptop. The download hangs up, and then the software can't connect to the sensor. After that, the only way to get it to reset is to let the battery die completely. To get that to happen, you have to wear the sensor on your finger for about 10 minutes, and the then, when you remove the sensor, it will try to save the new data, but it will never finish saving it, and it will hang up in this save mode, until the battery dies. Then you have to wait about 24 hours to wait for the battery to die. At this point, you can try to do the download again. It's a pain in the ass. So, your sensor is totally useless for 24 hours on a regular basis. Also, since I don't use their Bluetooth to connect to my cell phone, I don't need nor want their Bluetooth function, but their is no way to turn it off, so My fingers are not exposed to constant and totally unnecessary radiation. When I asked them to add a function for those of us who don't want to be exposed to this constant radiation, they blew me off by telling me that the level of radiation was very low, so don't worry about it. That is the same answer that all the wireless manufacturers give, but we are finding out that this is not true. I don't want to be radiated at all, so I eliminate all wireless radiation from my house.

I bought the O2RingS to track overnight oxygen and heart rate levels, and overall it delivers very well on its promises. What works well: - Accurate tracking: The O2RingS samples 200 times per second and stores one data point per second, which is much more frequent than the original O2Ring that stores one data point per 4 seconds. This makes it highly precise for overnight monitoring of oxygen saturation, heart rate. It also tracks movement, but it didn't indicate a lot of movement even when I had to get out of bed during the night. - Simple operation: Just slip it on and it starts recording automatically. Syncing with the ViHealth app is quick and reliable over Bluetooth. Data can also be synced to a PC using the included USB cable and the dedicated PC application. There is no difference in functionality between the mobile and PC apps. - Vibration alerts: If oxygen levels drop below a threshold, the vibration is noticeable but not overly disruptive—useful for sleep apnea monitoring. Things to improve: -Charging cable: Although the device uses a USB-C port, it does not support standard USB-C chargers or cables. You must use the included proprietary cable. Losing it could be problematic. - Comfort & design: The “one-size-fits-all” approach isn’t ideal—on smaller fingers it feels loose, on larger ones tight. Bottom line: If your priority is accurate, high-resolution tracking of oxygen and heart rate, the O2RingS is excellent. The automatic recording and reliable app integration make it easy to use nightly. However, the comfort/design quirks and reliance on a proprietary charging cable are definite downsides. For me, it’s a solid 4-star device—worth it if you need detailed oxygen data, but not perfect out of the box.

This ring is FANTASTIC! My mother has required oxygen for about 2 years now. Finding the right level of oxygen to keep her healthy was challenging because using a typical pulse oximeter only gives a reading for that moment. Oxygen saturation levels can change in a person quickly and if it's too low, permanent damage can occur. This ring allows my mom to monitor her own oxygen levels all the time. The display screen on the ring clearly shows her oxygen saturation in real time and has very good readability. Additionally, my dad connects the ring to the app on his phone and can also see her oxygen levels from across the room or the house. Furthermore, if her oxygen saturation drops below a limit he set in the app, an alarm will go off on the app and will cause the ring to vibrate. The app is easy to use and overall set-up was simple. We also love that the ring tracks my mom's heart rate. Since she has a-fib, this is a handy feature to monitor her heart rhythm. While it's not cheap, the ring is fairly priced for the value. The battery life is very good, but we bought two rings so that we can have one charging while she is wearing the other one. She does wear the ring 24/7 and says it's comfortable enough to sleep with and doesn't get in the way of living life. The ring is pretty durable. The silicone structure allows it to stretch for larger fingers. The company provides a good warranty and excellent service in the event the silicone rips. UPDATE: The silicone on the bottom of the ring did break, but the company was excellent to work with. They were very responsive to email and quickly sent a replacement ring. I provided the serial number and a picture of the broken ring and they made it right. THANK YOU! It's a pleasure to buy products from a company like this that takes great care of their customers.

I need to monitor my oxygen levels due to medical issues I found the ring with 24 hour battery much easier to manage than the 16 version Now I recharge it once a day for 3 hours. Overall it works really good. I don’t recommend using the alarm feature unless you set it really low. I have mine set to 84. Because the unit has issues of dropping for 1 to 3 seconds and back up for no reason. I was walking to my mailbox and got an alert that my O2 was 82. A second later it’s 91 then 97. I have mine sec to a 4 second averaging. Which helps a lot. They should offer a 10 seconds and 15 seconds averaging. To smooth the data. At first I was woken up a lot at night. Turned out to be the pulse alarm going off. I turned that off. It’s not unusual for pulse rates to drop in the 40’s or even 30’s. I’ve been using this for a couple weeks now and it nice to see overall how I’m doing. The smoothing of the data would be nice Their brightest level is not bright enough for reading when outside. I charge mine USB-C to USB-C with no issues. Their blood pressure monitor with ECG is nice also If you get it then get the case for it also If you carry something heavy in your hand that you wear the ring then you won’t get accurate readings If they add the data smoothing I’ll gladly increase the rating

This Wellue O2Ring-S Oxygen Monitor with Vibration Reminder is, in my opinion, an excellent device. It is exceptionally well designed, and has been durable for me in over one year of use. I charge it each morning, and holds sufficient charge to work for several days if I'm traveling and can't charge it. The screen is clear and tells me my heart rate and O2 saturation. Moreover, it connects to an app which I review each morning to see how my sleep O2 sat has been, and it gives me stats for every minute of the night. I also have downloaded the software on my laptop, and I have been able to print out well-designed graphs, which I showed to a sleep doctor, who was quite impressed. The device is simple, durable, cleverly designed, and helpful for me. The size fits me well, and stays on comfortably all night. While the price is somewhat high, I feel it is good value for the money given the data it provides for me. Getting this data through a doctor-managed sleep study would be more costly, and take much more time. Plus, I now have a device that allows me to monitor my O2 saturation every night, not just during a sleep study.

I have owned seven Wellue overnight oxygen rings, including multiple O2 Rings and the newer O2-S model. After noticing inconsistent readings, I tested them extensively by wearing multiple rings simultaneously and rotating them between fingers over consecutive nights. The results were alarming. The devices often disagreed significantly under identical conditions, with some reporting several times more oxygen desaturations than others. The O2-S even produced impossible results, reporting more 4% desaturations than 3% desaturations. Wellue acknowledged software issues and refunded that device. I also had two O2 Rings fail when the rubber component on the bottom of the ring broke. After reviewing my uploaded data, Wellue recommended returning my three remaining rings, but one was out of warranty and 2 were replacements which have no warranty so I am still testing them and averaging the results. I trusted these devices enough to adjust my overnight oxygen therapy based on their readings. That was a mistake. Based on my experience with seven Wellue rings, I would not rely on them for accurate or reproducible overnight oxygen monitoring. Update - July 14,2026 I compared overnight CSV data from two different Wellue O2 Rings worn under the same conditions on the same person. Although both recorded essentially the same heart rate and recording duration, one ring reported an average SpO₂ of 96.1% while the other reported 95.3%. More concerning, one ring recorded 959 readings at or below 95% oxygen saturation, while the other recorded 3,275 under identical conditions, more than a threefold difference. This was not an isolated occurrence but is consistent with similar comparisons I have performed. Based on these results, I do not have confidence that different Wellue O2 Rings provide consistent or interchangeable SpO₂ readings.