Description?: The solar charger converts the sun's light energy into 12-volt DC electricity and transports it to rechargeable batteries. Perfect for all cars, motorcycles, boats, marines, tractors, RVs, powersports, snowmobiles, trucks, etc. There are no electricity costs, totally environmentally friendly 8.5W Solar Car Battery Charger: Keep your 12V batteries charged with this solar battery charger, designed to compensate for regular small drains of the battery of the clock or vehicle alarm system. Easy to Install: The solar charger panel with 4 holes in the corners can be mounted on the windshield or simply place the charger where there is direct sunlight Efficiency & Stable?: Semi-flexible polycrystalline silicon and durable ABS ensure high energy conversion and long service life. Reverse Protection?: With built-in blocking diode prevents reverse discharge, ensure your battery does not drain. Convenient & Versatile: Includes a cigarette lighter adapter and alligator battery