IC-M604 21 Black, or IC-M604 22 Gray High performance full function VHF marine with one or two optional COMMANDMICs™ Superior receiver performance The IC-M604 has excellent receive specifications* which allow a weak signal a better chance of being heard when louder signals are around it. The powerful 5.0W (typical) audio output from the front facing speaker further increases the audibility and quality of received calls. * More than 80dB for intermodulation Submersible construction (1m depth for 30 minutes) The IC-M604, including the supplied microphone, withstands submersion in up to 1.0m depth of water for 30 minutes. It is equivalent to IPX7 waterproofing.*