Wellue Wrist Pulse Oximeter| 100-Hour Endurance Blood Oxygen Monitor with Audible Reminder, Rechargeble Checkme O2 Ultra for Tracking SpO2 and Pulse Rate, Comes with Free PC Software & APP

Exercise Marvel (but needs help)
I bought this to exercise with. I do not sleep with it. It works well but can be fiddley. The “ring ” part is too large for me. I was going to send it back, but I started trying other thing to keep the “ring” tighter. I tried duct tape, that did not work. then I tried a clip from my hot rollers and that works great! One cannot swing your arms excessively or curl the finger you have it on. If all else fails, turn it on and off. Once you get used to it, it is a marvel for those of us that need to watch our o2 as we exercise. There needs to be improved sizing for stability with exercise. If I was still, I think it would work as is.

It gets the job done, and that earned it 3 stars.
I bought this to improve my sleep, and the first night of sleep with it was some of the worst I’ve had in years. Even though I had vibration turned off, every single notification that came into my iphone caused the wrist unit to vibrate. The phone was on silent and didn’t vibrate. My apple watch on my other wrist didn’t vibrate, but this stupid thing wouldn’t stop vibrating every time I got a spam email overnight, because it picks up on something via the bluetooth and there’s no way to disable it without disabling all haptics in the phone.My only option was to disconnect the bluetooth to get back to sleep. Since this is a recording device, I was able to reconnect the bluetooth in the morning and download the complete session data, so it was able to do it’s job, but I will never again use it to sleep while real-time data is presented on my phone via bluetooth. What a stupid feature!I have thick fingers, and while I got good quality data with a high perfusion index using my thumb, I also ended up with a numb thumb because it was just a bit too tight, so I had to switch fingers in the middle of the night. Gladly I was already awake, since it shook my wrist to tell me about some email I got at 1 am. The sensor is excellent however, and it got sufficiently good data off my little finger (where getting reliable SpO2 data is difficult with most pulse oximeters), so feel free to try it on whatever finger fits best, keeping an eye on the PI.The documentation refers to an included data cable for PC use. Mine only came with a magnetic charging cable, and I’m not even sure where I could plug in a data cable. In any case, the iphone app allowed me to download the binary data into a cloud storage drive via the “files” iphone integration, and I was able to then use my PC software (OSCAR) to import the data from that cloud drive. So I suppose I don’t need the data cable?The app allows for multiple users, however you cannot review the data of one user while recording data from another. And due to both this, and the wrist vibration via notifications issue, using the app for real-time bluetooth data is not a good idea for someone sleeping, and for someone who is awake, you probably don’t need the recording feature and can use any old cheap fingertop pulse oximeter.Past all the negatives, the data it gets is very good, the 1 second data collection charts beautifully in OSCAR, and it checks off all the boxes of my “needs”. Just misses hard on some of the “wants”.edit (after a week of use):Battery life is better than advertised. I’m still on my first charge and may make it another WEEK. I think I’m getting the most of my battery life because I record each night without bluetooth (see above vibration issue), and in the morning download over bluetooth and then turn the unit off.The screen is too darned bright! On the DIMMEST setting. I’m not sure what the brightest setting exists for (maybe for someone who sleeps on the surface of the sun), because the dimmest is already as bright as my monitor in a well lit room. Again, on the dimmest setting, with the unit on my wrist facing up in my relatively dark (but not totally blacked out) bedroom and my eyes acclimated to the dark, I could watch a circle of light flashing on and off on my ceiling every time the heart symbol indicated my pulse! That’s too bright.I have been hoping I could get more used to the wrist strap. It isn’t uncomfortable, and it does it’s job, but it leaves a lot to be desired.