Check the listing for details. NEW Workman C4P5C 4-Pin Microphone to 5-Pin Adapter For Cobra CB Radio. Condition: New. Listed at 9.95 USD. icode813 This is a brand new Workman C4P5C 4-pin Cobra microphone to 5-pin adapter. Will convert the following 4-pin configuration: Pin 1 - Ground Pin 2 - Audio Pin 3 - TX Pin 4 - RX To the following 5-pin configuration: Pin 1 - Audio Pin 2 - Ground Pin 3 - RX Pin 4 - Common Pin 5 - TX Compatible Radios: Cobra 90LTD Cobra 140GTL Cobra 142GTL Cobra 148GTL Cobra 148-F-GTL Cobra 2000GTL Cobra 2010 Uniden Washington Uniden Grant XL Uniden Madison NOT compatible with Uniden Lincoln, HR-2510, HR-2600. That adapter is available here. Shipping: Free shipping via USPS First Class Mail. Ships in 1 business day. 30 Day Return Policy: Defective items will be refunded or replaced at no cost. All others must be returned in original new, unused/unopened condition.