Main Features: 1. Synchronise the phonebook of the android smartphones and service. 2. Date、 alarm clock、 phone、 stop watch、 phonebook、 message、 music play. 3. Bracelets watch fashion design. Function: Passometer、 Fitness Tracker、 Sleep Tracker、 Message Reminder、 Call. Reminder、 Answer Call、 Dial Call、 Push Message、 Control phone camera. Specification: 1. Adopts the world advanced oled luminescence screen、 hardening、 glass lense. 2. Adopting TI bluetooth chip、 signal stability、 power consumption. 3. Answer phone calls prompt、 back to dial the phone、 refused to call. 4. Alarm vibration and voice prompt. 5. 190 ma rechargeable lithium battery. Bluetooth version: V3.0 EDR. Bluetooth: A2DP + HFP1.5 + HSP1.2. Rechargable battery: 190mA lithium battery. Transmit range: 10M. Charging time: 2h. Standby time: 120h. Talking time: 5h. Music time: 6h. Diameter:40mm. Thickness:18mm. Work Temperature:10---40 degree. Storage Temperature: -0---50degr. Compatibility: Android.