A membrane switch is a thin layered (membrane) switch produced with polyester and adhesive components. It can also be made upon a P.C. Board and it can have surface mount components such as L.E.D.'s incorporated into the assembly. Membrane switches can be produced with or without a Graphic Overlay. The Graphic Overlay can have many options included in it such as windows and L.E.D. apertures, embossed keypads, and special finishes, to name just a few.