CB Amplified Loud Power Microphone For 4 Pin CB Radios Amplified CB Power Mike for more Transmit Audio! Ready to Plug into Most Standard 4 Pin CB Radios. 9ft Coiled Cord, Volum control & LED Battery Indicator. Requires 1 Optional 9V Battery. Fits 4 Pin Cobra, Uniden, Ranger, Galaxy, Connex, Midland, Superstar & other CB Radios.