Ideal for maintaining the battery of an infrequently used vehicle. Prevents power drain caused by radio memories, clocks, alarms & on-board computers. Amorphous solar cell technology, maintains the battery in peak condition, even in low light (cloudy) conditions. Smart control unit prevents solar discharge at night. Easy to use controller plugs directly into your vehicle’s cigarette lighter socket. Flashing ‘Red’ LED shows when the solar panel is producing power.