Two sensors design to make the quality of sound more true and clear The high quality transparent tube is not easy to be detected Extended 3.5mm earphone jack inlcuded Hear your HAM friends clearly even in noisy environment as your voice is transmitted via vibration of your throat Heavy duty PTT The elastic Velcro strap that suits head sizes from 12 to 25 inches. You can adjust the size freely. Specifications: Speaker: Sensitivity: 120 +/- 3dB &1kHZ Transducer: moving coil dynamic speaker Impedance: 32Ø +/- 15% &1kHZ Resonance freq (FO) 400HZ +/- 20% Rated input power: 200mW Maximum input power: 500mW Microphone: Sensitivity: -37.5+/-2dB &1kHZ 2.2KØ 3V 0dB=1v/pa Impedance: Max. 2.20kØ &1kHZ Directivity: Omni-directional Frequency: 100Hz - 16000Hz Max operation voltage: 10V Standard operation voltage: 3V; Current consumption: Max. 0.5mA; S/N ratio: Min. -56dB &1.1kHZ Working with below Yaesu / Vertex Handheld radios: FT-10R, FT-40R, FT-50R, FT-60R, VX-10, VX-110, VX-130, VX-131, VX-132, VX-150, VX-160, VX-180, VX-210, VX-300, VX-400, VX-410, VX-420,VX-424,VX-427, VXF-1, VXF-10, VXF-20, VX-1R, VX-2R, VX-3R, VX-5R.
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