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For commercial and recreational boaters, it comes with 6 watts of power. Includes all the great features in the M36, plus Float'n Flash and a larger capacity standard battery. Includes the channel history function; stores the last 5 channels used for easy recall at the press of a single button. Float'n Flash function700mW audio outputLow battery alert function2350mAh Li-ion batteryAquaQuake™ water draining functionDual/Tri-Watch functionInstant access to channel 16 and the Call channelWeather channels with weather alert functionIP7 waterproof rating