... walkie talkie,2 way radio Sound clear tube earphone TC-803 feature:• soft transparent catheter, small and comfortable wearing;. ... the ROHS and CE requirements Sound clear tube earphone TC-803 MicrophoneDimensional : 9.7*5.0mmImpedance : 2.2KOHM Frequence ... : 20-16000HzSensitivity : -36dB+/-2dB Sound clear tube earphone TC-803 Speaker Speaker size: 13mmSound pressure level: 84dB ±3dBImpedance: 32 ...