Speaker:
                Driver unit:40mm
                sensitivity: 106dB+/-3dB
                Impedance: 32 ohm
                Frequency response:20Hz-20000kHz
                Maximum Power Input:20mW
Microphone:
                Driver unit:6*5mm
                sensivity:54dB+/-3dB
                Impedance:2.2k Ohm

Wire length:2m+/-10%
Cotton cable
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