Koolertron&reg; Solar Power Panel Car Battery Charger 4.5W 12V For Automobile Motorcycle Tractor Boat Batteries Material: single crystal solar panel; Max output: 250MA 18V 10000Lux; Power: 4.5w Max;Temperature: 0-60 degree;Weight (approx.): 0.4KG High qualityimported high conversion efficiency panel; Convenient and practical; Safety and environment; Can work in bad condition; Long span life Fit 12V battery, working temperature 0-60 , back flow protection.; Easy to use: Plug into cigarette lighter This product is designed to supply power for outdoor 12V applicationssuch as automobile, Camping car, marine, Motor etc. It can charge your motor battery and keep enough capacity to protect the battery. It is convenient, environment, safety to maintenance your car battery at anywhere. This product had been proved be very popular in Germany. Note: LED indicator light intensity depends on different conditions. Do not worry if it blink weakly, it is not a quality problem. Besides,please make sure your battery is good. Or the effect may not be good enough.