Style: BC804NC 4-PinThe Replacement Noise-Cancelling Microphone gives you the comfort, convenience and functionality that you expect from! The ergonomic design gives you comfortable control and it is easy to use with the push-to-talk control button. It features noise cancellation that cancels out background noise for crisp and clear communication. Compatible with all CB radios, the BC804NC has 4-pin connection and a 9-Foot flexible cord.