Function: 1 Extra Electrete Capacitive Hanger Rod Microphone for Armorwerx / Comtac and similar earphones. 2. Weve fixed the volume / impedance problem of the microphone on the market PTT and radio. 3 Suitable for Comtac II / Comtac III / Comtac IV, plug and play installation 4 Professional manufacturing, excellent performance, clear sound. 5 Made of high quality ABS material, sturdy and durable, long service life. Specifications: