Feature:1. With high conversion rate, the charger can charge 12V batteries where there is sunlight.2. The environmental friendly battery charger can maintain the battery and extend its life while charging.3. Made of premium monocrystalline silicon, the has good scratch resistance for easy cleaning.4. The light weight makes the charger easy to carry for convenient outdoor car battery charging.5. Can be bent appropriately to apply to charge the battery of automobile, motorcycle, ship and so on.How to Use:Specification:Item Type: Solar Car Battery ChargerProduct Material: Monocrystalline SiliconModel: SC1820Solar Panel Power: 18V 20W (No Load Voltage 23V)Solar Panel Output Current: Maximum 1000mA (under summer sunlight)Solar Panel Size: Approx. 360 x 330 x 12mm / 14.2 x 13 x 0.5inApplicable Battery Parameters: 12V Battery (car battery/motorcycle battery/ship battery) (without battery)USB Output: DC5VInstallation Method:1. Park the car where the sun can shine; 2. Fix the solar panel on the windshield (or other location), this will not affect the safety of the line of sight, and it is easy to be exposed to the sun; 3. Insert the DC male end of the battery clip cable into the DC female end of the belt. Connect the red and black wires at the DC female end to the battery port in the middle of the controller. Then connect the black clamp to the negative pole of the car's battery. Connect the red wire clip to the positive terminal of the battery;4. Then insert the DC male cable pair into the output DC female hole of the solar panel;5. Connect the red and black DC male cables to the solar panel port on the left side of the controller. If your car pulls out