Portable media players; Portable sound recording apparatus; Portable sound reproducing apparatus; Acoustic devices; Computer measuring devices containing data; Computer memory devices; Data processing devices; Data processing input devices; Data readers being acoustic devices for data processing apparatus; Data readers being optical devices for data processing apparatus; Data storage devices; Data storage devices bearing data; Data storage devices containing photographs; Data storage devices for recording computer programs; Electric plug devices; Electro-optical devices; Electronic storage devices