The Ready-Lite RS Series pictogram Exit Signs operate with universal 2-wire AC input voltage and universal 2-wire DC input voltage. The sign is suitable for wall, end, or ceiling mount. The frame and back plate are both of one-piece steel construction. The faceplate(s) are constructed of robust clear polycarbonate panels with a border coloured factory white. The light source is white light-emitting diodes (LED), and provides even illumination in normal and emergency operation. The pictogram Exit Sign in a Self-powered configuration uses a sealed Nickel-Cadmium battery of 2.4V nominal voltage and stays illuminated during emergency operation for at least two hours upon AC failure.