Sound active (speaker), segala macam kabel listrik, kabel telepon, kabel antenna, W, VCD, DVD, pesawat penerima radio, tape recorder, video, mesin bicara, gramophone, rewinder, amplifier, loudspeaker, microphone, megaphone, headphone, wireless, optic, kaca mata, lensa­lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, walky talky, handy talky, pesawat telex, pita cassette, pita video disk recorder, laser disk, piringan hitam, compact disk (audio, video), antenna, booster, radar, parabola, accu, kotak accu, baterai, pengisi baterai, bel listrik, kabel telepon, transformator, travo, ballast, step up, step down, mesin faksimile, computer, mesin hitung, kalkulator, kas register, mesin teleks, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem, monitor (program computer), CPU, stop kontak, sakelar, switch-switch, fiting­fiting, stecker, sonar, seterika listrik, mesin fotocopy, disket, pesawat-pesawat pemadam api, alat solder listrik