The 22-432 Kenwood throat mic uses an "indirect air-borne vibrations" technique to receive vibration enter which is generated on the skin near the vocal cords. It features high isolation capability, not only for environmental noise, but also from frictional vibrating sound generated by the microphone head. 2 1/2 foot cord with two prong plug. Easy to use. Water, dust, and corrosion resistant. Works with most Kenwood FRS radios