The Uniden UM355VHF VHF Radio has been engineered with off-shore communications mind, the splash-proof radio housing is certified to meet the global JIS4 water-resistance specification, and the rugged splash-proof speaker microphone is perfect for operating on the water.The large LCD backlit display makes viewing easy, and the non-slip rubberised microphone and controls keep it easy to control. To top it off this unit allows you to boost the transmission from 1 to 25 watts giving you maximum transmission distance!