Blue tooth with MP3 StandardBluetooth v1.2　Operation Range10 meters(33 feet) Audio Code15 bits resolution,S/N>60DB Frequency2.4GHZ-2.4835 GHZ ISM Band Dimension(L)64 mm*(w)28.5 mm*(H) 11mm ConnectionPoint-to-point Weight55g(Including battery) Talk time4.0 hours Standby time100 hours Output PowerodBm(class11) Security128 bits encryption Power Consumption30 mA working,100uA standby BatteryRechargeable Li-in polymer 120mAh ChargingDC1.8V　Charging time2~3 hrs Operating Temperature-10~55 Storage Temperature-20~60 CertificationCE,FCC