ProComm, Inc. PSM4NC premium series Noise Canceling Power CB Microphone boots your volume for clear radio transmissions., The ProComm PSM4NC is a premium 4 pin DIN noise canceling power CB microphone that will make everyone sound like an Ace over the air. A 9 foot heavy duty mil-spec coiled cord with a 4 pin connector and a volume control that sits conveniently on the top of the mic. An optional 9 volt battery is required for power operation (not included). The PSM4NC sounds amazing even without an afterburner., A gentle on the eye blue LED lights up to indicator operating mode when using the PSM4NC in power mode. No need to guess if your CB mic is amping up the volume. As with most noise cancelling microphones it is recommended that you hold the PSM4NC closer to your mouth while speaking in a normal tone for best results., Every ProComm PSM4NC CB mic is meticulously assembled by hand and then rigorously tested to ensure that are getting the very best noise canceling microphone possible!, Compatibility, The PSM4NC CB mic is a 4 pin dynamic CB microphone. It is compatible with any CB radio wired for a standard 4 pin plug. This includes most newer CB radios from Cobra, Uniden, Galaxy, and Midland. For more information on CB radio microphone compatibility see our CB microphone guide.