Lithonia Lighting EDGR 1 R EL SD M4 recessed edge-lit LED EXIT sign with single-face red legend on a clear panel. Designed for recessed mounting and 120/277V AC operation. Includes sealed maintenance-free nickel-cadmium emergency battery backup for at least 90 minutes and self-diagnostic testing.=Lithonia EDGR 1 R EL SD M4 Recessed LED Exit Sign Red