... Stereo Bluetooth headset,bluetooth earphone,bluetooth headphone ·Hardware version: Rev.R03·Bluetooth specification: Bluetooth 1.2 compliant·Supported profile: A2DP, AVRCP, headset ... THD: 0.1%·Quality: 44.1, 48kHz 16bit stereo CD quality·Sensitivity: 96dB·Frequency response: 20Hz - 20kHz ... a) Link: 42mA b) Play music: 85mA c) Headset talking: 49mA·Battery: 3.7V lithium-polymer battery 550mAh ...