LOOKEE Overnight Wrist Oxygen Monitor with APP Report, Vibration Notification for Low O2 Level, Track O2 Saturation and Heart Rate

 I am shocked at how comfortable this. Also gives great insight to my cpap therapy. The coolest feature is that it can detect when your spo2 (bloody oxygen saturation) goes below a certain percent and can gently nudge you to sleep on your side or stop snoring.