Fitnessband with Bluetooth 4.0 function Track your activity + your sleep, and get it displayed in the free app Direct USB for charging the fitnessband (full charge takes approximately 30 minutes) Easy to use, just one button on the fitnessband Intuitive app for your smartphone (Android & iPhone) Pair with your smartphone via Bluetooth Supported devices: Android 4.3 with Bluetooth 4.0 and above, and iPhones/iPads with iOS 7.0 and above Caller ID display & SMS notification Pedometer function: Steps, distance & calories calculation Self-timer, find phone function Vibration alarm clock function 0.49� OLED display Built-in lithium ion polymer battery: 40mAh, standby time 3-5 days