Specifications: 1) Compliance with Bluetooth specification Version 1.1 2) Chipset: BlueCore 2-Audio single chipset 3) Profile Supported: Bluetooth Headset porfile 4) Radio of frequency:2.402 MHz~2480 MHz 5) Transmitter Power: Class 2(max 4dBm) 6) Transmission Range: Up to 10 meters 7) Receiver Sensitivity: -77 dBm 8) Talk time: Up to 4 hours 9) Standby time: Up to one week 10) Nominal charging time: Within 150 mins 11) Battery voltage:3.7V DC 12) DC Power Input requirement 6.6V DC to 7.0V DC (400mA) 100~240 13) AC adapter:6.6V DC to 7.0V DC (400mA) 12-24 14) Dimension:60(L)X18(W)X11(H)mm 15) Weight:10.8 g