Tape recorder, video, mesin bicara, gramaphone, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless, optik, kaca mata, lensa-Iensa, 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), antena, booster, radar, parabola, accu, kotak accu, baterai, pengisi baterai, bel listrik, kabel telepon, transformator, travo, ballast, step up, step down, mesin faksimile, mesin teleks, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem, monitor (program komputer), CPU, stop kontak, sakelar, switch­switch, fiting-fiting, stecker, sonar, seterika listrik, mesin fotocopy, disket, alat solder listrik, kabel listrik, kabel telepon, kabel antenna, IV, VCD, DVD, pesawat penerima radio