ProMar1 incorporates solid state and fully automatic technology that eliminates the need to use portable battery chargers for charging each battery on-board one at a time. Our compact design is lightweight and pre-wired for quick and easy installation. Mount it, plug it in and forget about it. The ProMar1 assortment is ProMariner's Recreational Grade boating and fishing series, designed to deliver years of automatic charging and conditioning performance with moderate charge times featuring a built-in safe maintenance mode for long or short term storage. Safe for Lead Acid or GEL batteries with features that include; 100 percent waterproof design, expanded LED Power and Charge status indicators, shock resistant durable molded case, and dual inline battery bank safety fuses for all 2 and 3 bank models. Other built-in safety features include over temperature, reverse polarity, and ignition protection. Fully Automatic Multi-Stage Charging Charge, condition and maintain batteries with a built-in safe Single Preset Charging Profile Use with Flooded Lead-Acid or GEL batteries. Expanded LED Status Center At-a-glance AC power, charging and ready / maintain LED indicators. Distributed-On-Demand Technology Automatically charges and maintains your engine crank battery Built-in Quality Safety 100% epoxy filled Completely waterproof shockproof.