Astatic 302-400070000 Replacement CB Microphone Switch for 636L Series Astatic replacement mic switch saves consumers the cost of replacing their entire microphone when just a switch has gone bad. 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 an unsurpassed legend in the communications industry. The polyurethane coated steel grille screen and low impedance dynamic element creates sonic clarity. Features: Replacement Mic Switch Use On Astatic 636L Series and RoadKing CB Microphones Bulk Package