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￢ﾀﾙ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% 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.