Keeps 12V batteries charged. Fully automatic. Turns On and Off as needed. Allows safe charging of RV, deep cycle, or most batteries that may have a long storage period. On-board feature allows mounting of charger nest to battery on collectibles, street rods, and other infrequently used vehicles. Hardware and mounting brackets are included. 1.5A trickle charge rate charges in 2 to 12 hours. LED lights indicate power On and charged. Reverse hookup protection. Molded plastic case. short leads for safety that won't get tangled in moving engine parts.