Dual Voltage 120/277 VAC, 60 Hz * Extra face plate included (Double Face) | Ceiling/back/side mountable (easy snap-fit canopy included) * Sealed Nickel Cadmium battery Provides 90 minutes of battery backup * Injection-Molded, V-5 flame retardant, high impact, thermoplastic white housing | Push To Test Switch * UL 924 Listed w/ Damp Location | Chevron arrow pop out | Compact, low voltage diconnect (LVD)