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)