The original Powerbox® Flipbox® is an individual light switching module that allows an individual ballast to run two separate lights - one at a time - by switching back and forth between each light, at a user-specified interval. Flipboxes have lots of possibilities and save lots of money, when compared to buying new digital ballasts. Double production without installing additional power circuits and save money on ballasts by using one ballast. Voltage independent - works with 120 Volt and 240 Volt ballasts. Fits Sunlight Supply® style ballasts. Use one Flipbox® per ballast and chain up to 20 Flipbox® modules together for simultaneous flipping. Hand-built at their California factory.