... acoustic 2.good quality 3.Convenient to use 4. CE, ROHS, FCC best sell new technology acoustic earpiece for two ... response20-16000HzSensitivity56dB±2dBImpedance2.2K Ω intercom earphone pictures HXKK Technology LimitedHXKK founded at 2004, localed in Long hua ... earphone, SPK&MIC, motorcycle earphone for two way radio, noise cancel earphone, wireless earphone, wireless PTT, computer earphone, MP3 earphone ...