The UltraGrow Premium Swichable Ballast (1000W & 400W) features a multi-volt power receptacle, easily allowing the use of either 120 or 240V power. Other features include: powder coated aluminum housing, easily mounts on walls or ceilings, air vent and heat shield convection cooling, rubber feet, constant wattage output, and soft starting to increase lamp life. Designed to match up with any of the UltraGrow reflectors.