Segala macam jenis Speaker aktif, loudspeaker, pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, pickup, rewinder, amplifier, microphone, megaphone, headphone, wireless, antena, booster, radar, parabola, stop kontak, sakelar, switch - switch, fiting - fiting, kombinasi fiting, stecker, tansfomotor, travo, stepdown, balats, stepup, accu, baterai, batu baterai, pesawat komunikasi, handphone, telephone, airphone, walky talky, handy talky, pesawattelex, faxsimile, pita - pita magnetik, pita cassette, pita video disk recorder, laser disk, piringan hitam, komputer, mesin hitung, kalkulator, kas register, pesawat - pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, optik, kaca mata dan bagian - bagiannya, lensa - lensa, mikroskop, teropong, teleskop, komputer, laptop, pesawat televisi, transistor (elektronik)