Active Gear Waterproof Activity Smart Bracelet / Band / Tracker, Sleep Tracker, Bluetooth, Black App OS IOS 7.1 & above / Android 4.3 & above Blutooth 4.0 Great Battery Life (55mAh) and 15+ days standby time. Includes Clip charger compatible only with Active Gear Waterproof Activity Smart Bracelet Highest Quality Components: Screen: 0.49'' OLED, CPU chip (Nordic nRF51822) and Sensor (konix kx022-1020) Accurate step pedometer (Walk, Run), Calorie counter, Distance Tracker,, Sleep monitor, Call alert/reminder, Alarm, Anti-lost, Camera remote control, etc. Waterproof vs sweat and rain (not for swimming), Tolerant of Hot/Cold Temps, High Tech material built to last