Energy-saving LED light source lasts up to 25 years. 120/277 dual-voltage input. Sealed maintenance-free back-up battery provides 90 minutes of emergency operation and lasts up to ten years. Fully automatic charger. Frame Color: White; Size: 12 1/4 x 2 1/2 x 8 3/4; Message(s): Exit; Insert Size: N/A.