It can be used as an alternative charger for cars, trucks, caravans, boats, motorcycles, RV batteries or any 12V lead acid battery. It is waterproof and can be placed outdoors. A voltage regulator is built in to keep the output voltage stable. You can install this item in your car and keep charging during the day. Provides 2 alligator clips and charging cable for all kinds of equipment, emergency lights, advertising lights, traffic lights, electric fans, solar water pumps, motorcycles, boats, etc. Specifications: Solar panel:10w Solar Panel Solar panel Power:20W Panel: Monocrystalline silicon Size: 210mm*175mm*2.5mm No-load voltage: 14V DC & USB 5.2V Load voltage: 12V DC & USB 5.0V Instructions: 1. First, the solar panel surface of the solar panel faces the sun, and the back USB output surface has a red light indicating that the current output is normal. 2. Plug the USB 2.0 cable into the USB output port, and the USB output standard 5.0V DC voltage. 3. Connect the mated DC alligator clip, and the alligator clip outputs a DC voltage of 12v (14V at no load). Note: The positive and negative crocodile clips cannot be connected or touched during use, which may cause short-term heat or burn the line. 4. With the mountaineering bag, this product is suitable for low-power products with 5V power supply or low-power products with 12V power supply. Package Contents: 1x Solar panel 1x Alligator clip 1x Cigarette lighter