For several years, the Wellue O2 Ring has been a critical element in caring for I my disabled wife who requires oxygen periodically. Using it has brought peace of mind to my wife’s caregivers and me that a drop in my wife’s oxygen level can be promptly responded to on a 24/7 basis.The first thing that stands out about the Ring is its accuracy. While physicians sometimes place less reliance on devices that are not FDA approved, my tests over time at the cardiologist’s office has confirmed that the Ring does provide reliable readings that are very closely correlated with oximeter devices the doctor uses. The real-time data the Ring provides allows us to respond promptly if my wife’s oxygen levels drop, ensuring she promptly gets the necessary response from her caregivers.One of the most impressive features of the Wellue O2 Ring is its smart vibration alert. Coupled with the dashboard reporting on the free IPhone app, it alerts the caregivers instantly, allowing them to take immediate action.The IPhone app is user-friendly and provides a wealth of information beyond the immediate reporting of drops in oxygen level. It not only displays real-time data but also stores historical data, making it easy to track trends and patterns over time. I’ve used this information in our discussions with my wife’s cardiologist providing a data based rather than anecdotal description of what my wife is experiencing.In summary, the Wellue O2 Ring has been an integral element in managing my wife’s health daily. It’s a perfect blend of innovative technology, user-friendly design, and practical functionality. I would highly recommend it to anyone in need of a reliable and efficient oxygen monitor..

I was SO IMPRESSED by this perfect little pulse oximeter that I felt compelled to share my opinion of it.I was hesitant to purchase any device, especially something for my wife, because I've been so unimpressed by convoluted user interfaces and difficult-to-use IoT gadgets in the past. But this little device is a true joy to use.The device itself has just one touch-button which simply lights up the screen to show its current readings. Its illumination can be set (by its apps) to low, normal or bright, and I recommend bright if you'll be viewing it outside or low if you'll be viewing it at night. Its clock and calendar will be set the first time it's connected to its apps. Again... the little device has no user interface other than an illumination button. That's all it does, since that's all that's needed.There's no on or off or anything else. You slip this onto a finger, it senses that it's being worn, so it turns on. If you take it off quickly, it resets and shuts down. If you keep wearing it, it begins logging once it's sure that you mean it. If, while it's logging, you take it off, it displays a short countdown from 10 to 0, giving you time to move it to a different finger, change your mind, or whatever. If you put it back on, the interval is ignored and logging continues. If you allow the countdown to expire, that session is ended.The device retains data for the most recent previous four (4) sessions. When you record a 5th session the oldest one will be replaced with the newest one. The device should "live" on its power cord. In other words, take it off and plug it in... so that it will always be fully charged whenever it's needed. You should think of it as a single charge per use. The battery is stated as 12-16 hours, so a full night's sleep will take it well down. So just be in the habit of keeping it plugged in.The mobile app for iOS is slick and perfect (and I assume that they did the same for Android). You do not "pair" the device's Bluetooth with your phone. Rather, the mobile app finds it and links to it. A single app can be used to collect the data from multiple devices if you wish. When the linkage occurs, any newly recorded sessions that the app hasn't already downloaded and stored will be obtained.The Windows desktop app works equally well. Using the included USB-A style interconnecting cord (you must use the one they provide for PC data retrieval) your device will be found and, as with the mobile app, any data that has not yet been downloaded, will be.Both mobile and desktop apps can show current and historical data and can dump to CSV (comma-separated value) or PDF report formats. And the use of one does not "take the data away" from the other. Each obtains any available session data that it hasn't already obtained.Having seen how well this works for my wife, I purchased a second device for myself so that we can use them at the same time. In one day she learned some very valuable information about the state of her respiration.Anyway, that's it. Five thumbs up for this little gizmo. It probably deserves your purchase. And if you think that this review was helpful and deserves to be seen by others, please take a moment to click that this was helpful to you. Thanks!

I bought this as I was recently diagnosed with severe sleep apnea, and am going through the treatment phases. Trying very hard to stay away from CPAP! On that front, am trying an oral device... and have had several sleep tests to measure pre and post device results. This is a frustrating process, as sleep tests are cumbersome, and insurance only covers occasional tests. In addition, as I have now learned, results on sleep tests can vary significantly depending on the night! For example, I have now learned that my apnea is worse when I sleep on my back. But two sleep tests I did were tough to compare since one night I slept several more hours on my back than another... That's where this device comes in: you use it every night.It is very easy to use, very comfortable, and generates a very easy to understand one page graphical report that shows O2 level and heart rate overnight (by second?). Calculates average O2 and heart rate for night, as well as some other stats: time with O2 level less than 90%, number of O2 drops > 4%, and number of drops per hour.I cannot vouch for the accuracy of this vs. a full-on sleep test device... but from what I can see it looks accurate. As importantly, because I am using it every night, I can compare results from night to night and see if there are things I can do to influence overnight O2 levels.One thing that it shows is that O2 performance can vary significantly from night to night. Another that it shows, in my case, is that alcohol consumption has a big impact on the apnea. Working on the weight loss thing, but too early to tell if that has impact. However, with this device, I will be able to see if it does much more quickly than if I have to wait for another traditional sleep test.So, this thing is very simple to use, very comfortable, and for me, incredibly informative. I print out the one page report and save it, so that I can compare readings over time.The only glitch I had, and this is minor, is that I had to repair (via bluetooth) the device to my iPhone when the Iphone did an iOS update one night. If you dig into the company website, you find that you just have to take some steps to repair, and after you do it works perfectly (with no loss of historical data).For anyone on the apnea spectrum (is that a thing?), I could not recommend this device highly enough...