A power transmission belt having a body defined by rubber and having an exposed outer surface, a fiber layer on at least a part of the exposed outer surface of the body, and a mixture including a resin adhesive ingredient, a rubber ingredient, and a lubricant that is a fluorine resin powder that is applied to the fiber layer. The device main body includes a semiconductor substrate mounting part and a first conductor provided around the semiconductor substrate mounting part. A third network device generates a second clock, receives the plurality of frames, generates time stamps based on the second clock, and transmits a first signal including the time stamps.