The SR Series LED exit sign with power pack’s housing and faceplates is constructed of steel. The exit sign has a maximum depth of 2-1/2". The faceplate(s) are supplied with standard knockout chevrons and the light source for the unit are LED lamps. The LED lamps provide illumination in normal and emergency operation and are mounted inside the exit housing, not on the face. The power pack is a completely self-contained emergency unit with its own charger and rechargeable battery. When a power failure occurs, the exit sign and the emergency heads shall illuminate in emergency mode for a minimum of 30 minutes. The power pack includes a test switch and a high charge pilot light. The heads require no tools to adjust and aim.