The Hydrotek LIGHTSPEED FLIP16 is an automated 8 ballast, 16 light switching unit which allows you to run 16 lights from 8 ballasts. These units work with ballasts plugged into any voltage. Heavy duty and built to last, they can be used with any 120V timer. Save money on your ballasts - use 8 ballasts to run 16 lights! Optional 240V timer outlet. Made in Canada.