Wattstopper’s ELCU-200 Emergency Lighting Control Unit is a self-contained device that allows any standard lighting control device to control emergency lighting in conjunction with normal lighting in any area within a building.PRODUCT FEATURES:- Guarantees emergency lighting remains ON or is turned on when power to the control device is lost - “Watchdog” feature allows emergency loads to be controlled in tandem with normal power loads - Integrated push-to-test button - Interfaces with fire alarm panel or security system - UL listed for use in emergency circuits