TRP's Emergency LED Drivers provide constant-power emergency lighting for at least 90 minutes. Distinct from other battery packs, this ensures a constant illumination level during the entire emergency egress time. A solid-state charger maintains the long life Nickel-Cadmium battery at full charge. When utility power is interrupted, the automatic transfer circuit switches to emergency mode to keep the LED load illuminated. When power is restored, the unit automatically returns to charging mode. Designed to meet Californias Title 20 energy efficiency requirements. Product Features: Provides 90 minutes of emergency lightingUse with normally-on, normally-off or switched fixturesUniversal 120-277V inputUL924 Classified for both factory and field installationIncluded 2-wire test switch and charging indicatorSuitable for sealed and gasketed fixturesUL Dry & Damp Location Rated, Class 2 output