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Brooks' Exit signs are flame resistant with high-impact thermoplastic housings and LED lighting. Each features a solid-state charger (except the AC-only unit), universal mounting, a test button, low-voltage disconnect, LED indicator, and replaceable pop-out chevrons. Five-year warranty (battery is prorated). Dual 120/277 VAC operation and a 4.8 V long-life, maintenance-free rechargeable NiCd battery ensure a minimum 90 minute illiumination during a power failure. Overall dimensions are 12-3/4" l x 7-1/2" h x 1-3/4" d.