Radio, radio cassete, televisi, tape recorder, amplifier, power ampli, loudspeaker, speaker, box, VCD, video, mesin bicara, gramaphone, headphone, wireless, optik, kaca mata, lensa-lensa, mikroskop, teropong, teleskop, pesawat telekomunikasi, telephone, airphone, walky talky, disk, piringan hitam, compact disk (audio, video), antene, boster, radar, parabola, accu, baterai, batu baterai, bel listrik, kabel telephone, transformator, travo, ballast, step up, step down, mesin faksimili, computer, mesin hitung, kalkulator, kas register, mesin teleks, mesin hitung, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem, monitor (program computer), CPU, stop kontak, sakelar, switch, fiting, camera, disket, mesin foto copy, setrika listrik, sonar, kombinasi fiting, disket, pesawat-pesawat pemadam api