Design Bluetooth Bracelet Vibrating-Caller W/ LCD ID Alert Vibration Wristwatch Watch Digital time NEW Design Bluetooth Bracelet Vibrating-Caller W/ LCD ID Alert Vibration Wristwatch Watch Digital time Anti-Loss Bluetooth Version:V2.1;Compatible with: V1.1, V1.2, V2.1; Voltage:3.6V-4.2V;Current:45mA;Frequency:2.4GHz;Charge time:2 hours Standby time:72 hours;Battery:Lithium Polymer Bracelet will Vibrate when call come and show callers number, answer the phone or press any button, it will stop vibrating. if you are not convenient to answer the phone, press the "B" button for three times, the phone will be hanged up. The Bluetooth bracelet with clock works as a timer(12 hours), the bluetooth bracelet is capable of every brand Bluetooth mobile phone Come without power adapter charger but is charged through PC with USB cable directly.