Dongguan Liangyu Electronics Co., Ltd.  

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Driver Specification
Driver: Φ 30mm mylar speaker
Impedance: 32± 10% Ω
Sensitivity: 115± 3dB(at 1K Hz)
Frequency Response: 20-20, 000Hz
Rated input power: 30mW
Maximum input power: 50mW

Microphone Specification
Element: Φ 9.7x6.7mm electret condenser microphone
Directivity: Omni-directional or Noise cancelling
Sensitivity: -42± 2dB at 4.5V, 2.2K Ω
Frequency Response: 20-20, 000Hz
Operation Voltage: 4.5V-10V
Connector: 2.5mm mono or RJ11