Pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, pickup, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, pita-pita magnetik, pita cassette, pita video, disk recorder, laser disk, piringan hitam, komputer, mesin hitung, kalkulator, kas register