The optional COMMANDMIC II makes it convenient for using your Icom VHF from a separate cabin or tower. It allows you to control most functions (except DSC operation) of your Icom VHF, including remote power ON/OFF, PA and RX speaker functions. 6.1m (20ft) of cable | Mounting base for cable connector | Microphone hanger This waterproof remote microphone ONLY operates with the IC-M504, IC-M422, IC-M502, IC-M602 & IC-M402. Color Black