The Revelation Series is architecturally designed for unobtrusiveuse in walls with cavity dry-wall with 4-inch studs or un-insulatedceilings with horizontal beams or T-bar structures. In normalconditions stand-by the unit is completely concealed in the wallor ceiling. In case of power failure the door of the unit rotates open180 and exposes the emergency lights two high-efficiency MR16lamps to illuminate the path of egress. Once AC power returnsor at the end of discharge period, the lights turn off and the doorrotates closed automatically, driven by a patent-pending, energy-storagecircuit. If needed the backbox can be shipped separately.