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: 12.25 x 2.5 x 8.75; Message(s): Exit; Material(s): Rugged Polycarbonate.