Technology Standard :   Bluetooth CSR V2.0 Headset Chipset :      BlueCore4-Audio Single Chipset Bluetooth performance standard: Support Headset and Handsfree profile Transmitter power:    Class 2 Wireless frequency:    2.4 GHZ-2.480 GHZ Sensitive:    < -75 dBm Transmitter distance:   10M Power Parameter Charger power:     INPUT 100-240 VAC,OUTPUT 5 VDC Working volt:   3.7V Battery:    Rechargeable Li-Polymer battery Charging time:   2-5 hours Talking time:   4 hours Standby time:    110 hours Package Information Product size (mm):   33*16*18 Headset weight   :    7g Packaging:      Headset + USB cable + using guide +colour box