... voice technology Background noise-free Throat mic for two way radio HLD-05 Innovative, patented voice technologyBackground noise- ... comfortableSilicon soft earphonesEnvironmental PU cable.Sensitive PTT button,Available for Motorola, Kenwood, Maxon, Icom, Standard and other brand ... :omni-Directional Frequency respond :100Hz-160kHz Impedance: 2.2k Working voltage:1V-10V DC Speaker Dimensions:Φ ...