An accessory device for a tablet computing device may include a base portion having one or more input devices (e.g., keyboards, trackpads, touchscreen displays, and the like) for providing inputs to the tablet computing device. The accessory device may include a coupling mechanism for releasably coupling the base portion of the accessory device to a tablet computing device in multiple different installation modes. The coupling mechanism may include an auxiliary display for providing a graphical output along a surface of the coupling mechanism. Additionally or alternatively, the coupling mechanism may include a recess for receiving a stylus.