Segala macam jenis speaker aktif, loudspeakers, VCD, DVD, MP3, 1V mobil, pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramophone, pick up, rewinder, amplifier, microphone, megaphone, headphone, wireless, anthena, booster, radar, parabola, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, transformator, travo, step down, ballast, step up, accu, baterai, batu baterai, pesawat komunikasi, handphone, telephone, airphone, walky talky, handy talky, pesawat telex, facsimile, pita-pita magnetic, pita cassette, pita video disk recorder, laser disk, piringan hitam, computer, mesin hitung, kalkulator, kas register, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, optik, kaca mata dan bagian-bagiannya, lensa-Iensa, mikroskop, teropong, teleskop, komputer laptop, pesawat televisi, transistor (elektronik)