5-Watt Solar Panel with built-in Battery Tender® super smart charging controller. 100% portable battery charging and maintenance. Perfect for storage space without power access! BATTERY TENDER SOLAR PANELS ARE THE ONLY PANELS AVAILABLE WITH A BUILT-IN CHARGE CONTROLLER TO PREVENT OVERCHARGING!Product Specifications:13.25" X 16" X 0.875"3 lbs12 V Nominal Voltage 270 mAmpsTemperature Compensation SensorSparkproof5 Year Warranty