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1.Plugs into cigarette lighter 2.Quick starts your engine 3.Operates under cloudy conditions 4.NO maintenance required 5.UV, RUST and shock resistant 6.Blinking LED indicator Plug into cigarette lighter ,The LED indicator's blinking indicates that the charger is charging for your battery .Ideal for automobile, trucks, multi-use on campsites, RV's & boats. The solar battery can make your battery never stranded again ! Trickle charger your battery with solar power.