This Vixen Cigarette Lighter Plug Adapter is designed for use with Vixen's GP, GP2, and GPD2 telescope mount accessories that operate on 12 VDC. This power-adapter provides the necessary 12 VDC power needed to operate various ancillary items such as; the D2M motor set, the Starbook S system, and many others. One end plugs into a standard vehicle cigarette lighter port, and the other end plugs into the device to be powered. It can also be used with most universal 12 VDC power supplies that are equipped with a compatible cigarette lighter port.