This Black and Decker Battery Maintainer and Trickle Charger will work with both 6-volt and 12-volt batteries. It is ideal for battery maintenance, charging RVs, specialty vehicles, antique and classic cars, motorcycles, lawn mowers, tractors, ATVs, snowmobiles, personal watercraft and more. There are two LED indicators—a red one for fault and a green one to show charge status. Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries.Includes : (1) Battery Maintainer/Charger, (1) 12V/DC Outlet, (1) Battery Clamps, (1) Ring Terminals Easy connection to vehicle battery using battery clips and O-ring terminals Stops charging automatically when battery is fully charged or topped off, switching to float mode monitoring Built-in circuit protection guards against overcharging, reverse polarity, or short circuit; ETL certified for performance and safety Mounting bracket built-in to charger for convenient placement