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Plug it into your cigarette lighter and it will trickle charge the battery and keep it from going dead. I have one of my own and i use it in the winters and when i'm going to leave the car for long periods of time.

Dave
 

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Its usefull when you leave the car for a long period of time and don't drive it like the dealers and showrooms,., but if you drive the car every day.,, its literlly not needed...
 
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