A loudspeaker audio accessory provides and non-cable interface to a portable radio. The computing machine may also include a system-restore server and a system-restore bus that allow the machine to periodically save the machine states in case of a failure. At least one of the substrates includes a structure as domain regulating means, and inclined surfaces of the structure operate to regulate azimuths of the oblique orientations of the liquid crystal when the intermediate voltage is applied.