Double sided Running Man sign in aluminum frame is the intrinsically safe, zero energy, environmentally friendly solution for marking emergency evacuation routes. Engineered with photoluminescent material that absorbs and stores fluorescent, metal halide or mercury vapor light, Egress signs create clear, brightly glowing egress pathways during emergency blackout or smoky conditions. UL listed. Visible at 50 feet. W25.4cm X L25.4cm Life Expectancy: 25+ yrs. (5FC/30 minutes 50 Ft).