New Power Slider feature - switch from 120 volt to 240 volt with easeThe Sun System 10 MH/HPS Switchable Ballast has the ability to run either MH or HPS lamps from one ballast. Simply flip the switch to the appropriate position MH or HPS, screw in the matching lamp and youre set. The Sun System 10 Ballast is Sunlight Supplys economy-priced ballast. Features include a die-cast aluminum housing with white powder coated finish, louvers for cooling and rubber feet. Sun System 10 ballasts all feature quick-disconnect adapters and multi-tap transformers, which means that you can switch them from 120V to 240V in just seconds. Although the Sun System 10 is made in China, its proven track record over the years and 5 year warranty show that it is a solid, reliable ballast. The 15 heavy duty detachable lamp cord sold separately makes installation a snap; no hard-wiring necessary. Now features our Alumapro™ aluminum core ballast for optimum performance NEW - Exclusive Power Slider™ - switch from 120 volt to 240 volt with ease. Comes standard with 6 foot 120 volt Smart Volt™ grounded power cord. Purchase 240 volt cord separately. Die cast aluminum housing Louvers for cooling Rubber feet - reduces noise, vibration and provides air flow under the ballast for cool running Multi-volt ballast White powder coated finish High temp domestic capacitor ensures long lasting durability All Sun System 10 Ballasts come with a 5-year warranty. 15 Lamp Cord and socket assembly sold separately. Sun System 10 ballasts are available in 400W, 600W and 1000W HPS models, 400W and 1000W MH models, and 400W and 1000W MH/HPS switchable models.NOTE: All Sun System 1 and Sun System 6 ballasts normally ship preconfigured for 120V. But, changing your ballast from 120V to 240V has never been easier. Simply unplug the 120V Smart Volt power cord from the ballast, move the Power Slider to the 240 volt position and plug in the 240V Smart Volt power co