Equipped with productive bone-conduction transmitter-receiver factory and company, Fenghuo Hongsheng is one of the leading China wireless earphone manufacturers and suppliers. Welcome to contact us. Bone-conduction Earplug Transmitter-Receiver is integrated the transmitter with the receiver, so it has the features of convenient for wearing and light in carrying. It is suitable for equipped with every kind of mobile communication equipments. The piezoelectric transmitter and dynamic receive are installed in the earplug. When it is connected with the communication equipment, the users can communicate with others by putting the plug into the ear. It has good humidity proof, rainproof and anti-dust performance and the features of higher anti-noise, reliability and environment adaptability. It is special suitable for the whole weather under the circumstance of higher humidity and temperature. Main Technical Specifications:   Operating voltage: 3V～5V Transmitting sensitivity≥(-10±5) dB/0.316g(peak) Receiving impedance: 600(1±25％)Ω(1000Hz) Receiving sensitivity≥105 dB/mW(1000Hz)