ESA08/3H/MT/MH Mains Powered Battery Backup Exit Sign is a fully self-contained illuminated exit sign. It has an inbuilt battery, battery charger, controller and test button. The LED Light source provides low power consumption and long life. the acrylic panel is printed with a dot matrix lens effect pattern and overlaid with a polypropylene diffuser to provide high brilliance and even illumination over the full surface of the sign.