Shenzhen Caforre Technology Company Limited  

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Microphone:
Measurement: 6.0*5.2 mm
Frequency: 20-16000Hz.
Sensitivity: -36dB, +/-2dB
Resistance: 2.2K ohms

Speaker:
Measurement: 13MM
Sensitivity: 84 dB, +/-3dB
Resistance: 32 ohms, +/-15%