Ключевые слова: abstract, alert, amplifier, announce, announcement, announcer, attention, audio, background, blue, broadcast, bullhorn, communication, concept, danger, electric, electricity, horn, industrial, information, isolated, loud, loudspeaker, mega, megaphone, message, music, object, outdoor, phone, pole, post, power, public, relations, retro, sky, sound, speaker, system, technology, texture, vintage, voice, volume, warning, white, wire, wires,