A microwave oven with a control panel including a case, a circuit board mounted to the case, and a coupling device adapted to couple the case and the circuit board. The implantable magnet can be combined with an electric switching function depending on the orientation of an external magnetic field, thus protecting an implanted coil andor implant electronics against induction of over-voltage or performing an electric switching function for other various purposes. An exemplary apparatus includes a shaft and one or more electrodes that have a main portion and a needle portion. The invention also provides pharmaceutical compositions comprising such compounds, methods of using such compounds to treat conditions associated with mu opioid receptor activity, and processes and intermediates useful for preparing such compounds. The rear face of the interchangeable label holder also includes a first securing element and a second securing element functional for receiving lateral edges of the display plate crossbar to restrict lateral movement of the label holder. Even when a perfect match does not exist between the pattern of the fingerprint of the person to be authenticated and registered patterns, a person can be authenticated without fail and the amount of computation can be omitted significantly.