Input mechanisms can employ a case for an electronic device that provides input capabilities to enhance the user experience when using the case in concert with the electronic device. For example, a case can provide an electromechanical touch sensor to provide the user with an input mechanism that does not require actuation of the button of the electronic device. The electronic device, upon detecting the presence of the case, can disable one or more buttons and perform actions corresponding to the buttons when signals are received from the case.