Use the Monster USB PowerPack to power almost any two USB devices at home, in the car or on-the-go. The charger plugs into an AC wall outlet or can be used in the car with the included cigarette lighter adapter. The USB output provides up to 5W, 12V output provides up to 12W. The cigarette lighter adapter provides up to 10W of power. Retractable prongs can be folded in for portability.