A PCB-based membrane keypad is a kind of interface technology that contain several layers of thin, flexible membranes that are printed using conductive ink. Between two rigid PCBs, these membranes are sandwiched and create a low-profile, durable interface. The flat, smooth surface of PCB-based membrane keypads is often easy to clean and impervious to water and other substances. To complement the branding and aesthetics of the product, they can also be customized with different graphics, colors and textures.