Like the fact it’s comfortable to wear and accurate readings!

three nights, so far so good. after reading negative reviews i go to the trouble of lightly wrapping the device to my finger and hand with a bit of athletic bandage to protect it during sleep.

ibid

Very convenient

This is a great product, to help track your sleep O2 levels and train yourself to sleep in the best position.
This is the perfect product (if you have normal fingers) for those with positional sleep apnea. I have sleep apnea, if and only if I sleep on my back. The ring monitors your sleeping O2 level and will buzz (vibrate) when the number falls to low, prompting you to roll over or take whatever action needed. Over time, it will train you to sleep in the prefer position. It stores up to 4 sleep sessions and easily downloads to your phone for review. Its only downloads to the phone or to an email, I would give this a 4 of 5 rating because, I find reading the results on my phone to be too hard. It is comfortable to wear, no different from wearing a watch or ring but it is large. Monitoring your O2, means red light is emitted continuously throughout the night, its didn't bother me but I was constantly concerned it would bother my spouse. The battery will last 2-3 nights and charges within 2-3 hours. I love concept and the product line but unfortunately this was not the device for me. I have skinny fingers, size 4 ring finger, it loses contact and gives me a false low oxygen reading. The band doesn't fit snug because I have skinny fingers, size 4 when normally size is around 6 for women. Also it is largish, and can catch in the sheets or bed clothing preventing the necessary amount of contact with your skin for a good reading, particularly if you have skinny fingers. I am returning this to try a different model in the same product family, thank you Amazon for your great return policy, because I think this is a great concept, I just need to find the right fit.