Designed to work with or without an AC ballast, the ECO-BAL3000TD-SDT emergency ballast provides reliable lighting for one or two fluorescent lamps in emergency mode. With a universal 120-277V voltage input, it features a 14.4V NiCd battery, a push-to-test switch, and self-diagnostics. The steel-housed unit can be installed inside, on top, or remotely, and is compatible with a range of fluorescent lamp types.