A wearable device includes a core unit which is interchangeably attached to a container. The container may be configured to couple to a user, where the container may include a touch interface having a touch sensor associated with at least one surface of the container, a first inter-module communications interface (ICI), and a controller coupled to the touch interface and the ICI. The core unit may include a display, a second ICI which is communicatively coupled to the first ICI, a memory to store instructions and a processor. The processor may be configured to execute the instructions stored in memory to receive information through the first ICI and second ICI generated by the touch interface, where the information may be associated with a user command, and perform an operation in accordance with the received information associated with the user command.