Excelvan 12V 4.5W Solar Panel Charger Portable Solar Car Charger Mono Crystalline Silicon with Cigarette Lighter Plug, Battery Charging Clip Line for All 12V Car Motorcycle Battery Supplement power to all your 12V car batteries and creates 4.5 watts of energy. Universal installation in vehicles of 12V, including car, motorcycle, boat, ATV, tractor, boat,etc, so as to extending their batteries lifetime. Also charges other 12V rechargeable batteries in emergency, especially for your working, traveling or camping in the wild. Charges in all daylight conditions, even on cloudy days. Durable, portable and environmental friendly.