ALLPOWERS 18V 7.5W Portable Solar Car Boat Power Sunpower Solar Panel Battery Charger Maintainer for Automobile Motorcycle Tractor Boat Batteries ALLPOWERS SunPower car battery maintainer can charge 12V batteries with the power of the sun and create 7.5 watts of energy SunPower solar panel works in all daylight conditions and is weatherproof (some rain drop is OK, but not completely rainprooffor added durability Works with automobile, motorcycle, tractor, boat batteries and more Built-in blocking diode to prevent reverse discharge Package: ALLPOWERS car battery charger, cigarette lighter plug, clip line, suction cupds, instruction manual, 18-month warranty and friendly customer service