Galaxy and Infinity electronic ballasts feature the exclusive Smart Volt™ feature; Operates on both 120 & 240 volt power. Simply unplug one cord and plug in the other. 8-foot 120 volt power cord included. Purchase 240 volt cord separately when usinf 240V input voltage. Galaxy ballasts can ignite both HPS & MH lamps, very quiet operation, rubber feet reduce noise and vibration, short circuit protection, with constant wattage output—no lamp flickering. Galaxy ballasts come wired with a female receptacle for use with all Sunlight reflectors. Optional adaptor available for use with Hydrofarm reflectors. 5 Year Warranty on Galaxy ballasts