All Product Industrial(Hk) Holdings Limited-Victory Electronics Ltd  

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Driver Unit: Diameter 40mm
Speaker Impedance: 32ohm+/-15%  
Speaker Sensitivity: 100dB+/-3dB
Speaker Frequency Response: 20-20, 000Hz  
Maximum Power Input: 50mw
Microphone Operating Voltage: 4.5V
Microphone impedance: 2.2 KΩ
Microphone sensitivity: -58dB+/-2dB
Microphone Frequency Response: 30-16, 000Hz
Cord Length: 2.2 meters