*Adjust the volume key, number redial, voice dialing, call reject * Bluetooth version V2.1 * Bluetooth protocol: HFP, HSP wireless bluetooth headset for mobilephone* Adjust the volume key, number redial, voice dialing, call reject* Bluetooth version V2.1 * Bluetooth protocol: HFP, HSP* Transmission distance: 10 meters* Standby time: 50 hours* Talk time: 3.5 hourspackage information:Weight: only 9 ...