Tigerhu Fitness Tracker Watch, Smart Band with Bluetooth 4.0 Sleep Monitor Calorie Counter Pedometer Sport Activity Tracker for Android and IOS -Smart wristband with OLED screen, show the steps, Calorie, Distance, Time, Sleep quality clearly. -Bluetooth 4.0 low-power wireless data synchronization -Adjustable snap strap design: the size can be adjusted according to the size of the wrist, more comfortable to wear -Support IOS and Android system phone:1)Android phone:Support bluetooth 4.0,Android system is android 4.3 or above. 2)ios phone:Support bluetooth,ios system is IOS7.0 or above