Telepon genggam ( hand phone ), batterai hand phone, pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, rewinder, amplifier, loud speaker, microphone, megaphone, handphone, wireless, VCD, optik, kacamata, lensa-lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, walky talky, hand talky, pesawat telex, pita-pita magnetik, pita cassette, pita video disk recorder, laser disk , piringan hitam, compact disk ( audio, video ), antena , booster, radar, parabola, accu, kotak accu, baterai, pengisi baterai, batu baterai, kotak baterai, bel listrik, kabel telepon transformator, travo, ballast, step-up, step down, masin faksmili, komputer, mesin hitung, kalkulator, kas register, masin teleks, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem, monitor ( program komputer ), CPU, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecter, sonar, seterika listrik, mesin fotokopi, disket, pesawat-pesawat pemadam api, alat solder listrik