Equipped with productive anti-noise transmitter-receiver factory and company, Fenghuo Hongsheng is one of the leading China helicopter headset manufacturers and suppliers. Welcome to contact us. Model OSK-63A Anti-noise Transmitter-receiver adopts the structure of neck ring soft strap. It is the audio terminal for radio sets and other communication equipments. It can transmit and receive voice signalcleaely in the high noise environment condition.  Main Technical Specifications:  Operating temperature: -40℃～+55℃  Weight≤650g  Frequency range: 200Hz～4000Hz  Transmitting impedance: 150(1±15%)Ω(1000Hz)  Transmitting average sensitivity≥0.6mV/Pa  S/N≥12dB  Receiving impedance: 2×300(1±15%)Ω(1000Hz)  Receiving average sensitivity≥95dB/mW  Sound insulation amount≥20dB