The ValuLine Ballasts are the best value priced garden lighting ballasts available. The cases are powder coated galvanized steel, vented to provide cool operation. They have a vibration dampening system for noise reduction. They are very quiet. All ValuLine lighting can be run at 120 or 240 volts. No rewiring is necessary. They will all run either M.H. or H.P.S. bulbs (with the exception of 600w which will run H.P.S. bulbs only.) They come with a 120 volt power cord. ValuLine Lighting Systems carry a 5 year rebuild or replacement warranty