Telecommunication devices and apparatus; video frequency devices and apparatus; audio frequency devices and apparatus; personal stereos; stereo amplifiers; stereo receivers; radio tuners; stereo tuners; digital broadcasting receiving tuners; television receivers; audio and video receivers; digital audio and video network receivers; digital audio and video network players; players and recorders for optical discs featuring sound and images; audio cassette players; audio cassette recorders; video cassette players; video cassette recorders; portable digital audio and video players; cases for portable digital audio and video players; stands for portable audio and video players; apparatus for reproduction and recording of audio and video memory cards; record players; phono equalizers; car stereos; video recorders, video players, audio recorders, and audio players with built-in hard disk drives; video projectors; video projector screens; video display apparatus; audio and video signal analog-to-digital converters; audio and video signal digital-to-analog converters; loudspeakers; wireless speakers; megaphones; audio speakers; cabinets for loudspeakers; speaker mounting brackets; speaker mounting stands; headphones; wireless headphones; personal headphones for sound transmitting apparatuses; earphones; wireless earphones; horns for loudspeakers; loudspeaker systems; microphones; audio and video signal processing apparatus; portable radio communication machines and apparatus; portable telephones; smartphones; sound and video recording carriers; personal digital assistants; watch type personal digital assistants; blank data media (magnetic and optical); blank magnetic cards, magnetic discs, magnetic tapes and data medias; cabinets adapted for audio and video apparatus and computers; remote control apparatus; remote controllers and remote control apparatus for use with audio and video apparatus and computers; digital radio transceivers; computers and computer peripheral devices; portable computers; laptop computers; tablet computers; wearable computers; wrist computers; smartwatches; interfaces for computers; computer keyboards; computer mouse; monitors for computers; sound circuit boards for computers; video circuit boards for computers; speakers for computers; radio tuners for computers; optical disk drives; hard disk drives; semi- conductor memories units; USB (universal serial bus) memories; flash memory cards; digital audio and video network servers; computer software; computer software for recording, transmission, reproduction, receiving, downloading, storage and/or editing of sound or images; computer software for transmitting and receiving e-mails and other information; computer software, recorded; routers for telecommunication and computer network; communication hubs and computer network hubs; modems; document printers; phonograph records; downloadable music files; sound or video recorded magnetic cards, magnetic sheets, magnetic tapes and optical discs; exposed cinematographic films; exposed slide films; slide film mounts; downloadable video files; recorded video discs and video tapes; power supply devices; batteries for computers; cables for use with audio and video apparatus and computers; loudspeakers with built-in amplifiers; karaoke machines; power distribution or control machines and apparatus; rotary converters; phase modifiers; batteries and cells; solar batteries; AC/DC converters; computer application software for personal digital assistants, smartphones and tablet computers; electronic publications, downloadable; home theater systems; telephones; intercoms; digital photo frames; voice receivers; in-wall audio amplifiers; in-ceiling audio speakers; personal sound amplifiers; voice controlled loudspeakers