Magellan TW0200SGHNA Echo Fit Smart Sports Watch with Activity Sleep Tracking and Heart Rate Monitor-Bluetooth Smart (Black) Compatible with the following: iPhone 4S and later; phones with Android 4.4 and later Key sports data, like pace, time or yards to hole stream from your app to your wrist in real-time. Conveniently see and use the app data that's been hiding on your smartphone. With your smartphone safely tucked away you can remotely control sports app functions and music on your phone. Tracks steps, distance traveled, calories burned and the number of hours slept independent of your phone. Ultra low power, does not need charging. Saves smartphone battery life by acting as a external display.