Ключевые слова: address, alert, amplifier, announce, announcement, attention, audio, background, blue, broadcast, building, bullhorn, cement wall, communication, concept, electric, horn, information, loud, loudspeaker, megaphone, message, metal, music, nobody, object, old, outdoor, power, public, retro, shout, siren, sky, sound, speak, speaker, sports, symbol, system, technology, tell, urban, vintage, voice, volume, wall, warning, white, wire,