IP-X8 submersible, plug-and-play connectivity, controls all function (including DSC) of Icom's IC-M504 or IC-M604 VHF marine radios. Large LCD with adjustable lighting level. Doubles as an intercom. IC-M604 accepts up to 2 COMMANDMICIIIs. It's like getting a second (or third) on-board radio station for the cost of an accessory.

Instructions for using the COMMANDMICIII are included as part of the IC-M504 and IC-M604 instruction manuals. 

Other features

• The COMMANDMICIII? (HM-162B/SW) remote-control microphone size (W ? H ? D): 65.5 ? 150 ? 38 mm; 2.5 ? 6 ? 1.5 in.
• Weight (approx.; except cables): 13.6 oz.
• Supplied accessories:
     6.1m (20ft) of cable, OPC-1540, with external speaker terminal
     Microphone hanger
     Mounting base for cable connector