Smart Health Ring, Featuring Stress and Sleep Monitoring Functions, Compatible with iOS and Android

Model No.: HRM-SR-2 Material: Stainless Steel Size: #8/#9/#10/#11/#12/#13 Wireless Communication: Bluetooth Battery Capacity: 16 milliamps Applicable Systems: Android 5.1and above, IOS8.2 and above Function: Heart rate, blood oxygen, sleep monitoring, gesture-based photo taking