Specification :

Superior receiver performance
The IC-M604A 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.

Submersible construction
( 1m depth for 30 minutes)
The IC-M604A, including the supplied microphone, withstands submersion in up to 1.0m depth of water for 30 minutes. It is equivalent to IPX7 waterproofing.*