3 way switch On/Off/On for the duel power. It runs on 12 volts DC but gets it 2 different ways. The wire running out the back is about 4ft long with red and black alligator clamps on the end, to hook to a car battery. On the other side is a female plug for a 120 volt AC to 12 volt DC power supply to plug into.
Picture Added 09-26-2010 01:17 AM Added by Handyman