Check the listing for details. ASTATIC RD104E RED ROAD DEVIL 4PIN CB AMPLIFIED NOISE CANCEL POWER MICROPHONE. Condition: New. Listed at 69.95 USD. NEW ASTATIC RD104E amplified electret noise cancelling microphone with 4 pin connector. Wired for Cobra, Galaxy, Uniden, President, and many other CB radios. The Astatic D104 microphone is perfect for mobile CB, Amateur AM and SSB operation. The amplified mic provides extra modulation for highest power level. Rugged construction with Red body and black grille screen, volume control and metal hanger for reliable operation. Flexible heavy duty coil extends to 7-1/2Ft. Frequency response 300-5KHz. Output level -42dbm. 100ohm impedance. Requires standard 9 volt battery (not included). The classic Astatic microphone provides optimal frequency response and clarity for maximum power. NOTE: This microphone is NOT compatible with the Cobra 19 Ultra III, 19 LTD II, Uniden Pro 505XL, Pro510XL, Uniden Pro520XL, and other radios that have condenser "gray-bar" style electret microphones. These radios supply a voltage on the audio line which interferes with the circuitry of the power mic. WIRING:PIN 1 - Shield / GroundPIN 2 - AudioPIN 3 - TX PTT TransmitPIN 4 - RX Receive Control Visit our eBay store for other radio accessories.