WEGO Hybrid Wrist Activity & Sleep Tracker With Integrated Bluetooth Connectivity, Powered By The Map My Fitness App Powered by the map my fitness app Integrated Bluetooth 4.0 BLE wireless connectivity Built in rechargeable battery included Silent Alarm to let you know you achieved your goals plus a Wake up Alarm Compatibility iPhone 4S and newer iPad 3rd generation and newer iPad Mini and newer select Android devices running 4.3 and later for a full updated list of compatible devices Visit joinwego.Com/compatibility