Impedance:16 OHM Bluetooth Version:Bluetooth V3.0+HS Power level:CLASS II Output power:20mW THD+N=1% Bluetooth distance:W/O obstacles≦10M Audio frequency response:80HZ-20 KHz Bluetooth frequency range: 2.402-2.480GHz Working voltage range:3.0V-3.7V Sensitivity: -86 dB 0.1≦ Microphone Sensitivity:-453dB