Data processing apparatus; computers; computer programs, downloadable; computer peripheral devices; monitors [computer hardware]; tablet computers; computer hardware; smartwatches; smartglasses; interactive touch screen terminals; humanoid robots with artificial intelligence; electronic interactive whiteboards; wearable computers; network servers; electronic styluses; encoded identification bracelets, magnetic; digital voice signal processors; downloadable software applications for mobile phones; computer software applications, downloadable; facial recognition apparatus; biometric hand readers; digital signs; telephone apparatus; video telephones; cell phones; navigational instruments; network communication equipment; wearable activity trackers; computer network hubs; television apparatus; loudspeakers; cabinets for loudspeakers; horns for loudspeakers; megaphones; audio mixers; audio- and video-receivers; sound transmitting apparatus; sound recording apparatus; tape recorders; sound reproduction apparatus; camcorders; portable media players; headphones; microphones; virtual reality headsets; car video recorders; set-top boxes; cameras [photography]; security surveillance robots; audio switching apparatus; audio amplifiers; stereo tuners; closed circuit television cameras; audio transmitters; audio interfaces; equalizers [audio apparatus]; digital sound processors; video projectors; audiovisual teaching apparatus; infrared detectors; inductors [electricity]; thermometers, not for medical purposes; hygrometers; air analysis apparatus; detectors; lasers, not for medical purposes; diagnostic apparatus, not for medical purposes; optical apparatus and instruments; mirrors [optics]; cables, electric; wires, electric; data synchronization cables; chips [integrated circuits]; light-emitting diodes [led]; switches, electric; electric sockets; apparatus and installations for the production of X-rays, not for medical purposes; theft prevention installations, electric; electric door bells; locks, electric; alarms; electric plugs; contacts, electric; voltage stabilizing power supply; video screens; remote control apparatus; home remote controls; adapter plugs; electrical adapters; power adapters; sensors; biometric fingerprint door locks; peepholes [magnifying lenses] for doors; eyeglasses; batteries, electric; chargers for electric batteries; earphones; touch screens.;