The portable Coleman 2-Watt Solar Battery Maintainer offers an ideal way to maintain the batteries of cars, SUVs, boats, tractors and more. This unit is completely maintenance free and easy to install. Made with durable ABS plastic and amorphous solar cells, this solar panel charges in all daylight conditions, even on cloudy days. The panel plugs directly into your cigarette lighter and the suction cups allow for easy mounting of the panel to a window or a dashboard. The complete kit includes: 2-Watt solar battery maintainer, 7.5 ft. wire, 12-Volt DC plug, suction cups for easy mounting, and battery clamps. It has a temperature range of -40 to 176°F.