WEGO Relay Wireless Activity Sleep Tracker Powered By Map My Fitness App With Called ID/text Notification Powered by the map my fitness app Caller ID/text notification - Transfers full sms messages and call notifications directly from your smartphone to your wrist Auto sleep - automatically detects when you Go to sleep and Wake up without manual pressing of the button to set anything Ships with steel blue strap (that is easily changeable) 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