Made of durable abs plastic and amorphous solar cells. Excellent for maintaining the batteries ofcars boats suvs tractors and more. Amorphous solar panel works in all daylight conditions even on cloudy days. Maintenance free and easy to install. Charges in all weather conditions. For indoor useinside the dash of a vehicle or by a window indoors as it is not waterproof. Plugs into cigarette lighter with included battery clamps. Includesbattery clamps 12 v dc plug wiring connected to the solar panel and suction cups to mount panel onto windshield.