An object of the present invention is to reduce variations in the value of the output potential VDD of a regulator circuit including a bias circuit referring threshold voltage. The distal face has an eccentric port and a central port. The document has printed thereon visible user information and invisible coded tags. A certain piece of radio communication capacity is allocated from the arrangement of repeatedly occurring frames to a non-dedicated fast signalling channel between the mobile stations and the base station. The fitness information may include an indication of the intensity level of the user’s exercise, the total amount of calories burned by the user during the exercise, the amount of fat calories burned, and the amount of carbohydrate calories burned. The bumper resiliently compresses during pivoting of the first surface in the arc towards the second surface while in contact with the first surface and the second surface.