BM800 BM800 Boat Monitor 12-48V Boat Monitor Battery Cable Easy Installation Great for boats that don't need the additional features of the Bilge Sentry Runs 24/7 without drawing power from your boat. The Boat Monitor is the system's brain - where data from your boat is continually collected and sent to your app. The system runs on an internal battery with up to four months of power and charges itself every time your boat batteries are being charged. In other words, it is completely maintenance-free a

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