Double sided and protected by a polycarbonate face plate, Fulham's FLPL51-D-B-W FreeLite photo-luminescent exit sign is self-luminous and uses no electricity. It has a black background and field applied directional chevrons. With a 25-year estimated life and virtually no maintenance (no bulbs or battery to replace), you can feel confident that this glow-in-the-dark exit sign will provide high visibility in total darkness and smoke filled conditions for years to come. This exit sign is designed for surface mounting only. Flag or ceiling mounting is possible, but optional mounting bracket (sold separately) is required. It includes a white frame and has a legible viewing distance of 50 feet.