Receiver, televisi, video CD, pesawat penerima radio, tape recorder, video, digital CD, laser disc, amplifier, loudspeaker, headphone, microphone, megaphone, rewinder, pita-pita kaset, pita video, piringan CD, computer, mesin hitung, kalkulator, pesawat-pesawat ukur, amperemeter, speedmeter, meteran listrik, voltmeter, aparat untuk perekam, mengirim atau mereproduksi suara atau gambar, pembawa data magnetic, disk perekam, wireless (teepon tanpa kabel), walky talky, handy talky