The Astatic Model 636L Noise Cancelling Dynamic Microphone is ideal for CB, amateur radio and SSB communications. It fits all 4-Pin CobraUnidenand Galaxy radios, and effectively reduces wind and vehicle noise. Durable construction is combined with a polyurethane-coated steel grille and soft vinyl lip guard. It also includes Astatic's exclusive heavy-duty coiled cord extends to 7 1/2 feet. Astatic's tailored frequency response provides maximum talk power.