Maintain the charge of any auto, truck, marine or RV 12 volt battery. Compensates for small steady battery drains. Maintain the charge of any auto, truck, marine or RV 12 volt battery. Compensates for small steady battery drains.Plugs into 12 volt cigarette lighterBlinking LED charge indicatorPanel mounts easily to windshield or dash - includes suction feet for mountingIncludes cigarette lighter adapter and battery terminal clamps