The 400 Watt switchable ValuLine Ballast cases are product of powder coated galvanized steel, vented to offer cool operation. They have got a vibration dampening system for noise reduction, making them extremely quiet. All ValuLine lights can also be run at 120 or 240 volts, so no rewiring is essential. The 400 Watt switchable ValuLine Ballast will run either M.H. or H.P.S. bulbs, and it comes with a 120 volt power cord. The ValuLine Ballasts are hands-down the most productive price priced garden lights ballasts to be had. VMInnovations is a licensed C.A.P. dealer!