On the side of the unit is a small black flap that covers two prongs that you can plug a standard 110-120 volt extension cord into which will charge the unit. There are 3 read lights and 1 green lights on the top that lets you know when it is fully charged. The 12 volt charging cord is basically a cord that has 2 cigarette lighter plugs. One plugs into the unit and the other plugs into a power port/cigarette lighter plug.
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