Equipped with productive anti-noise transmitter-receiver handset factory and company, Fenghuo Hongsheng is one of the leading China military handset, radio handset manufacturers and suppliers. Welcome to contact us. Model OSOK-2B Anti-noise Transmitter-receiver Handset can be used as the audio terminal for various radio sets and civil communication equipments. The product is beautiful in appearance, easy to operate; and it also has the better performance of water-proof and moisture-proof.  Main Technical Specifications: Operating temperature:-40℃～+55℃  Dimensions: 194mm×46mm×68mm  Weight≤380g  Frequency range:200Hz～4000Hz  Transmitting impedance: 150(1±20%)Ω(1000Hz)  Transmitting sensitivity≥0.5mV /Pa S/N≥16dB  Receiving impedance: 600(1±20%)Ω(1000Hz)  Receiving sensitivity≥104dB/mW