Astatic RD 104E Road Devil 4P externe luidspreker Suitable for 2m (146 MHz) Suitable for 2m (146 MHz) and 70cm (430 MHz) amateur bands control your transceiver from radio software This 4 pin microphone is suitable for use with 27MHz The RD 104E is equipped with an electronic equalizer that allows you to achieve maximum speaking power and intelligibility in the noisiest environments