In an image formation method of an image formation apparatus for correcting uneven image formation on the basis of vibration property information corresponding to an operation sequence in image formation, vibration property information corresponding to a plurality of operation sequences are stored in a storage device. Hopping-related information is received at a mobile station from a base station. The optical receiver unit extends forward from the user’s face, and the receiving element may be mounted at the outer end of the optical unit to enhance transfer of information from the front of the handheld or foot operated transmitter unit. The join between the shaft and the mount is located above the rear part of the cuff.