USA – LED Exit Sign, White thermoplastic housing, Internal toggle switch for red or green letter color selection, UL indoor damp location 50°F to 104°F (10°C to 40°C) listed, For use with Dual voltage 120/277V AC, Replaces Catalog No. EXR-LED-EL and EXG-LED-EL, Test switch and status indicator for low maintenance, with Emergency Ni-MH Backup Battery, Provides 90 minutes of illumination in the event of a power loss