Suppliers of membrane switches and keypad services fabricate assemblies using flexible membranes, domed or flat switch profiles, and tactile and non-tactile switches and panels.  Product capabilities of suppliers of membrane switch and keypad services can include numerical keypads, graphical keypads, control panels, and membrane switch overlays.  Numerical keypads include numeric or alphanumeric switches and keypads for data entry, operation of menu-driven software, entry of word commands, etc.  Graphical keypads are image or graphic-based keypads for machine or process navigation and operation.   Graphics may conform to international standards or be customized to the application.  Common graphics include arrows, pictorials of machine operations or processes, etc.  Control panels include full function panels for monitoring and control of machine, process, or system variables and commands. May include inputs, outputs, and interfaces tailored to the application.  Membrane switch overlays are graphical or alphanumeric covering for keypads indicating key or switch functions.