This 12V solar battery trickle charger is ideal for boats, vehicles, RVs, and more. Completely weatherproof charger is constructed from durable ABS plastic. Solar panel absorbs energy even on cloudy days and features built-in overcharge/discharge protection. Maintenance free and easy to install. Trickle charger includes 4 stainless steel screws, 9-1/2' wire, 12V DC plug, and battery clamps. 13" x 14" x 3/4".