Adaptoe, stabilizer (AVR), televisi, tape recorder, radio, video, amplifier, loud speaker, VCD, wireless, laser disk, compact disk (audio, video), piringan hitam, antena, pita cassette, pita video disk recorder, mesin bicara, gramaphone, pickup, rewinder,microphone, megaphone, headphone, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, boster, radar, parabola, bel listrik, kabel telepon, transformator, travo, ballast, step up, step down, mesin faksimil, komputer, kalkulator, kas register, mesin telex, printer