An insulating film is provided over one surface of a first semiconductor layer including a first oxide semiconductor including indium as a main component, and a second semiconductor layer including an i-type second oxide semiconductor is provided in contact with the other surface. The calendar also has a magnetic element, supported by the cover member, to hold metallic pieces such as paper clips for a user to keep the surrounding surface organized. In an operation mode for performing the reading, processings A1 to A4 are performed. To lower the seat, the handle is operated to intermittently engage the second latch with the spur gear, thereby rotating the spur gear in a direction opposite the first direction to drive the arm. Further, the circumferential range of each recess is larger than that of each projection.