computer disc, disk dan pita kaset audio dan video, Peralatan pengolahan data dan komputer, tape recorder, amplifier, speaker, equalizer, tuner/radio, compact disc player, VCD player, DVD player, laser disc player, kabel audio, microphone, pesawat telepon, pesawat televisi, diskette, alat-alat potret, alat-alat optik, pesawat penggerak otomatis, mesin-mesin bicara, kas register, batu battery, pesawat video, antena parabola, booster, ballast, trafo, disk optik, bel pintu listrik, mesin teleks, audio mixer, professional power amplifier, sound processor (compressor limiter, active crossover, professional equalizer, echo, delay), professional speaker system (untuk band, -untuk lapangan, -untuk studio), aparat dan instrumen pengajaran dan pendidikan, perangkat lunak komputer