Tigerhu Fitness Tracker Watch, Smart Wristand with Bluetooth 4.0 Sleep Monitor Calorie Counter Pedometer Sport Activity Tracker for Android and iOS, Black The high quality Tigerhu Fitness Tracker accurately tracks your real-time activities from the following aspects: Sleep Monitor, Step Pedometer, Calorie Burned Monitor, Message and Call Reminder and Sports Modes Automatically recognize your status and monitor the whole sleep progress with analyzing the deep sleep and light sleep hours The smart fitness tracker is made of waterproof material which allows you to swim or take showers freely The built-in USB plug makes it convenient to charge with any USB block or computer. And it has long battery life as one charge generally can works for 7 days Support bluetooth 4.0,Android system is android 4.3 or above. 2)ios phone:Support bluetooth,ios system is IOS7.0 or above