Astatic 636L CB Noise Canceling Microphone 4 Pin plug Black - 302-636LB1 Product Information: Astatic microphones are engineered to surpass all stock mic options, providing superior sound quality for CB, Amateur, and Single Side Band communications. Premium noise canceling sound quality and a rugged design make these microphones unsurpassed legend in the communications industry. The polyurethane coated steel grille screen and low impedance dynamic element creates sonic clarity. Product Features: