This edge-lit exit sign made of aluminum housing and clear acrylic panel. It meets UL924, NEC, OSHA & NFPA 101 Life Safety Code requirements. Super bright with red letter EXIT LED emergency light are visible from up to 100 feet away and play an emergency warning role. LED emergency exit sign lights built-in Ni-Cd 3.6V backup battery provides minimum 90 minutes of emergency operation during a power outage and safe for charging. 120V-277V AC universal voltage operation for wide places. 【EASY INSTALLATION】This exit sign with emergency lights with 3 mounting options: top mount, side mount and back mount (canopy included). 【WIDE RANGE APPLICATION】This edge lit with single sided clear acrylic edge panel are widely use in bussiness facilities to provide illumination in different positions such as office buildings, exit doors or stairways in schools, churches, hospitals,canteen,commercial building and industrial building. TANLUX Red Exit Signs for Business, LED Edge Lit Exit Sign, UL 924, Hardwired Emergency Exit Lights with Battery Backup, Aluminum Housing with Rotating Acrylic Clear Panel, AC 120/277V, 2 Pack