A radio frequency identification tag may have a non-responsive mode, triggered by a command from an RFID reader, that temporarily prevents the RFID tag from responding to a query from any RFID reader for a period of time. In exemplary embodiments, a medical device receives a therapy adjustment from the patient. The method may also include defining a second object. The fourth impurity concentration is less than the first, second and third impurity concentrations. A child twists the first tip into the axle hole of the wheel for reaming. The second coil magnetically excites a portion where the magnetic pole portion of the rotor faces the second magnet.