Stabilizer, radio, televisi, tape recorder, video, mesin bicara, VCD, pesawat komunikasi, amplifier, loud speaker, telephone, walky talky, handy talky, pesawat telex, pita cassette, pita video disk recorder, laser disk, compact disk (audio, video), antena , boster, radar parabola, transformator, travo, ballast, stepup, stepdown, mesin faksimili, mesin, hitung, komputer, speedometer, ampere meter, volta meter, meteran listrik