Radio, televisi, tape recorder, video, mesin bicara, pickup, gramaphone, rewinder, amplifier, loud speaker, microphone, megaphone,headphone, wireless, Vcd, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, pita-pita magneti k, pita cassette, pita video disk recorder, laser disk, piringan hitam, compact disk(audio, video), antena, boster, booster, radar, parabola, kabel telepon, transformator, mesin faksimil, komputer, mesin hitung, kalkulator, kas register, mesin teleks, printer, disket