Ключевые слова: alert, amplifier, announce, announcement, audio, background, blue, broadcast, cable, communication, danger, distribution, electric, electrical, electricity, energy, engineering, equipment, high, horn, industrial, industry, lamp, line, loud, loudspeaker, megaphone, message, network, object, pole, post, power, public, pylon, sky, sound, speak, speaker, supply, system, technology, transmission, vintage, voice, voltage, volume, warning, white, wire,