A display is partitioned into a plurality of cells. The device is configured such that an auto store key for directing execution of an automatic save, and a save destination of the secondary setting data when the automatic save is directed, are displayed on the display. The ratio IIb of peak intensity I at 2\u03b8 to diffraction intensity Ib at a midpoint angle between peak angle 2\u03b8 of the diffraction line derived from the plane and peak angle 2\u03b8 of the diffraction line derived from the plane is 2 to 10. The magnesium oxide particles are manufactured such that the halogen atoms exist particularly at the surface of each of magnesium oxide particles through to a depth of 4 nm or less toward the core of each of the magnesium oxide particles. The share adjust amplifier overrides any feedback voltage currently being provided by the PWM controller and takes direct control over the duty cycle of the drive signal.