Abstract: An electronic device may include a touch-screen for receiving user input, a processor coupled to the touch-screen, a removable flexible material contacting the touch-screen, the flexible material having a plurality of key structures that modify a first touch applied by a user to a key structure of the plurality of key structures into a different, second touch applied to the touch-screen to generate a touch event, and a memory coupled to the processor and including computer code which when executed by the processor interprets the touch event generated by the second touch according to the first touch. A key structure may include physical structures that allow the user using the sense of touch alone to distinguish a key structure.