This solar charging kit provides up to 20 watts of clean, free, renewable power for RVs, homes, boats, and vehicles. Made of durable ABS plastic, the weatherproof solar panel features built-in blocking diode protection from battery discharge at night. Maintenance free and easy to install. Solar charging kit includes 4 stainless steel screws, battery clamps, CLA adapter, 12' wire, voltage tester, and 8.5-amp charge controller. 38" x 13-1/2" x 1-1/2".