Pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, pickup, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless, optik, kaca mata dan bagian-bagiannya, lensa lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, pita-pita magnetik, pita cassette, pita video disk recorder, laser disk, piringan hitam, anthenna, booster, radar, parabola, accu, baterai, batu baterai, transformator, travo, ballast, stepup, stepdown, kabel listrik, komputer, mesin hitung, kalkulator, kas register, pesawat-pesawat ukur, speedometer, ampre meter, meteran listrik, volta meter, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, mainan video, video compact disc/VCD, pesawat video,VCD player, DVD player, laser disc player, kabel audio, diskette, mesin teleks, audio mixer, professional power amplifier, sound processor (compressor limiter, active crossover, professional equalizer, echo, delay), alarm, CPU, monitor, hardisk, printer, printer key-boord, mouse