... volume control on/off Light,comfortabl Bluetooth headset hidden/with microphone 1: Bluetooth 2.1 wireless transmission protocol 2: Transmission ... and range(10m, 360°) 3: High SNR Bluetooth audio connection 4: No wire,no transmitter,no software,no setup, it is ... 85dB,working Voltage:3.7V,current:30mA speaker size:Φ30mm11: Microphone Spec.:100Hz~10kHz&SRN≥55dB&Sensitivity:-42dB Packaging list: Wireless ...