An example assembly includes a core module including a processor, a display, a touch user interface (UI) element extending around at least a portion of an outer periphery of the display, and a non-transitory computer-readable medium storing instructions; a housing configured to removably receive the core module; and a cover selectively positionable in a first position to expose the touch UI element and the display, and in a second position to cover at least a portion of the touch UI element and at least a portion of the display, wherein the instructions, when executed by the processor, cause the core module to: when the cover is positioned in the first position, operate the display and the touch UI element according to a first functionality UI mode and, when the cover is positioned in the second position, the display and the touch UI element according to a second functionality UI mode.