The M37 marine VHF handheld delivers a powerful 6 watts RF output power, has 700 mW loud audio output, AquaQuake which uses vibration to clear water from the speaker, IP57 dust-protection and submersible waterproof rating, 2350mAh li-ion battery pack which will provide longer-lasting operation, Float n' Flash technology to help locate if radio is dropped in water, plus channel history function which stores the last five channels used for quick and easy recall. The comfortable grip design with a large display and buttons for easy operation makes this the perfect VHF communications workhorse radio every boater should have on board.