... size6.0*5.2mmFrequency response20-16000HzSensitivity56dB±2dBImpedance2.2K Ωwalkie talkie acoustic tube earphone pictures HXKK Technology LimitedHXKK founded at ... 2004, localed in Long hua,BaoAn,Shenzhen, there are more than ... earphone for two way radio, noise cancel earphone, wireless earphone, wireless PTT, computer earphone, MP3 earphone, and MINI SPK ...