They provide the interface between the user and device.  Cosmetically, they show company logos and product branding through the use of color and graphic design.  Functionally, they describe connectors, LED indicators, digital displays, etc., as well as provide tactile feedback when used with membrane switches (link here).  Clearly, your graphic overlay supplier must meet, or exceed, your expectations.

NEXTECH uses the latest in digital printing, as well as traditional screen printing, to provide our clients with the best overlay solution.  Based on your design requirements and annual volume, we will quote the best method to meet your needs.