Noise Canceling POWER Mic CB/Ham Radio 4 pin Astatic RD104E-4B Road Devil (302-10036) Features a High Gain Amplifier with Electronic Equalization Provides Maximum Talk Power and Intelligibility even Under Noisy Conditions Designed for Close Talking Handheld Applications For CB, Amateur Radio and SSB Communications Wired with 4 pin plug for Cobra, Uniden, Galaxy, etc.