Keep 12-volt batteries fully charged during short or long term storage. Maintains 12-volt lead acid batteries (sealed and vented) up to 150 amp hours. Fully automatic 120-volt battery maintainer and charger is ideal for personal watercraft, recreational ski and wake boats, ATV's, tractors and more. Offers concealed mounting holes for on-board installation and rear die cut foam resting pad for portable use. Ring terminal and DC clamp quick connect cable assemblies included. Marine-grade design is weatherproof, water resistant and can be used indoors or outdoors. Energy Saver mode monitors and automatically maintains battery as needed to maintain a full state of charge. Significantly reduces AC power consumption, lowers operating costs and maximizes reserve power performance. Built-in reverse polarity Pre-wired for easy installation Mfr. 3 year warranty | Promariner ProSport 1.5A Battery Maintainer