Handheld computers; electronic calculators having the functions of telephone books, address books, calendars, schedule books and memo books; computer software pre-recorded on magnetic tapes, cards, discs, optical discs; computers; computer keyboards; printers; monitors; mouses; scanners; light pens; optical disc drives; modems; PDA (personal digital assistants); electronic personal organizers; digital cameras; printers for digital cameras; printers for computers; computer software for a personal computer for use in achieving data exchange between a personal computer and a wrist watch or a digital camera; electronic calculators; electronic label printers; cellular telephones; radio pagers; LCD television sets; navigation apparatus and instruments; car navigation apparatus and instruments; radios; compact disc players; audio tape recorders; video tape recorders; projectors, parts and fittings thereof; visual presenters, parts and fittings thereof; memory units, parts and fittings thereof; apparatus for recording, transmission or reproduction of sound or images, parts and fittings thereof; apparatus for scanning, processing, transmitting and projecting images and pictures; batteries