... Impedance32 Ω ± 15%Audio output100mW Frequency response200-5000 HZ intercom earphone microphone Microphone size6.0*5.2mmFrequency response20-16000HzSensitivity56dB±2dBImpedance2.2K Ω intercom ... , Our main product is two way radio earphone, SPK&MIC, motorcycle earphone for two way radio, noise cancel earphone, wireless earphone, wireless PTT, computer earphone, MP3 earphone, and MINI SPK.those ...