Comfortable and with alarm
I'm using the ring because my SpO2 levels can be low due to sleep apnoea. This ring is by far the best I could find: it wears very comfortable. Tip: wear it with the big part at the inside of your hand, it measures equally well and will not stuck to your blankets when moving your hand around. Also needed and hardly supported: it will vibrate when the levels are too low, or if you heart rate is too low. I've had some problems with the lifespan of the rechargeable battery but it was quickly replaced under warrantee without any trouble. Kudu's for TrendMedic!