The M12 and the DW lights comes with a 6ft length adapter cable. The Snap-On version cannot be powered by the vehicle battery because of the higher voltage requirement. If you forgot to charge the battery or you depleted the battery charge on a long job and you did not purchase a 2nd battery, you can just plug this cable into the barrel connector that normally plugs into the battery and attach the alligator clamps to the 12 volt vehicle battery. Then you have many many hours.