The Keystone KT-EMRG-LED-20SD-2000-EN /DF is a LED Emergency Back-Up, 20W Constant Wattage Emergency LED Driver Design with Self Diagnositics. Approx 2000 lumens, Dual Flex Cables, 120-277V Input. CEC T20 Compliant. Includes Instructions, Test Switch, Switch Plate Cover, and Wiring Accessories. AC LED emergency back-up for recessed and integrated fixtures. Optimized for recessed LED downlight fixtures and retrofit kits, and Keystone DirectDrive compact lamps.