A frequency divider includes a first frequency divider stage coupled to a clock signal and operative to generate a first frequency divided signal. The belt 150 extends diagonally on a back surface 101a of the first casing 101 from a mounting portion provided on one side surface 101b side of the first casing 101, so as to approach the far side portion of the first casing 101 as a distance from the one side surface 101b side is increased, and reaches a mounting portion provided on a far side of the first casing 101. The first sheave portion has a centrally extending post. And a fitting arm which is elastic enough to be transformed is protruded from the plate. Regions between and above the coils may include magnetic fields approximately parallel to the surface of the platform so that electronic devices may be charged while standing up during operation by a user with reduced exposure to magnetic radiation.