Schumacher SP-400 4.8W Solar Battery Charger/Maintainer Charges 12V lead-acid batteries and extends battery life Water-resistant, and ideal for boats, cars, motorcycles, snowmobiles, trucks, RVs and more Environmentally friendly and works in cloudy conditions Contents: (1) Schumacher SP-400 solar panel (1) 12V DC adaptor (1) clamp adaptor (4) mounting screws (1) owner's manual SPC-7A Charge Controller is recommended (sold separately) for extra overcharge protection Not compatible with the WM-12 or EC-25 quick connect cables