Perfect for keeping your boat, car, tractor, motorcycle or any 12v house battery topped up. It includes battery clips and a cigarette lighter adaptor for simple connection, and will mount easily on windshield or dash (suction cups provided). The built in blocking diode prevents any drain on your battery at night. Provides up to 1.5W charging power, which is plenty to prevent idle discharge of your expensive vehicle battery, works even on cloudy days.