Primera Waterproof Bluetooth Smart Watch Bracelet Wristband Activity and Sleep Pedometer Step Calorie Counter Sport Fitness Tracker 1. Multi function: 1- Watch function, time display. 2-Incoming call notice. 3-Camera remote. 4-Fitness and sleep tracking. 2. Measuring your daliy walking distance precisely. 3. Calculating the consumption of calorie, record the daily burn-up calorie. 4. Reminding for dringking, taking, meeting,etc. 5. Bluetooth OS Compatible: Android 4.3 OS, IOS 7.1 or above, BT 4.0