The Brady 90492 directional sign displays a NOT AN EXIT legend on a 3-1/2 x 10 inch (H x W), glow-in-the-dark, pressure-sensitive polyester surface that requires no electricity, batteries, or wiring. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right.) The green on red NOT AN EXIT sign can glow for up to 10 hours with a five-minute charge, and is in accordance with the Association for the Standard Testing of Materials (ASTM) 2030-99 recommendations for photoluminescent safety markings. Brady exit signs are often used in industrial, utility, commercial, and institutional environments.