Bluetooth Bracelet Show caller ID on LED screen Vibrate when call come Prevent mobile lose Apply to all bluetooth mobile. Specifications:* Color: Black and White* Connectors/Ports: Charging port* Buttons/switches: A, B* Bluetooth Version: V2.1* Voltage: 3.6V-4.2V* Current: 130mA* Frequency: 2.4GHz* Input Voltage: 110~240V* Frequency: 50Hz* Input current: 0.15A* Output Voltage: 5.7V* Output ...