Bluetooth 4.0 Technology 13 function activity tracker - Pedometer, Distance Traveled, Calories Burned, Sleep Cycle, Time Clock, Text Messaging Alerts, Social Media Alerts, Call Alerts, Alarm Clock, Anti-lost, Remote Photo Shoot, Time Sedentary, Heart Rate Adjustable band - One size fits most Includes box and instruction booklet Use with free Hryfine APP Compatible with Android 4.3 and above, and iOS 8.0 and above