With our exclusive Power Pointer�, it's easy to switch from 120 to 240 volt power! Simply unplug the detachable 120 volt power cord (included), turn the Power Pointer� arrow down for 240 volt power and plub in a 240 volt power cord (sold separately). THAT'S IT! High quality ballast will ensure years of trouble-free use. Lamp cord receptacle - Accepts all Sun System� lamp cords (sold separately). "Donkey Ear" flaps hold lamp cord plug securely in place. High temperature capacitor ensures long lasting durability. A barrier wall between the ballast and the capacitor/ignitor helps keep the critical components cool. Heat slots & louvers remove excess heat from the ballast. Aluminum ballast enclosure dissipates heat. Ballast features copper windings.