* dial diameter: 1.54 inches
* outline dimension: 43.5*40*9.8mm
* watch strap length: 22cm
* fitness and health: (exercise program, track record) sleep quality monitoring.
* Call function: (dial, hands-free, phone records, phone book)-support whatsapp.
* tools: calculator, alarm clock, calendar.
* photo: (watch camera, watch control mobile phone camera)
* Entertainment: (mp3/mp4 local player, Bluetooth music player)
* 3 kind of display clock, free switching.
* electricity can be used for about 3 days.
* use Android 4.4 or higher, iOS 8 or higher, a mobile phone compatible with Bluetooth 4.0. (ios support part function)