computer disc, disk dan pita kaset audio dan video, tape recorder, amplifier, speaker, equalizer, tuner/radio, compact disc 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), sarung tangan pelindung, kalkulator, Kacamata, mainan video, video compact disc/VCD, mainan elektronik, kaset, tape disk magnet atau disk optikal dan dicetak dalam papan sirkuit, pelindung kepala, helm, perangkat lunak komputer