Smart Rings Health Ring Blood Oxygen Blood Pressure HR Heart Rate Monitor
Smart Rings Health Ring Blood Oxygen Blood Pressure HR Heart Rate Monitor Fitness Tracker Sleep Step Counter Waterproof Compatible with ios Android Phones with Charging Case (Black, #11-V1/2-2.54in) 【Sleep Smart Ring】: This health ring uses optical sensor technology to monitor heart rate and blood oxygen saturation, providing intuitive data support for your health. When night falls, the built-in gravity sensor...