Ключевые слова: advertisement, alarm, amplifier, announce, announcement, attention, audio, broadcast, broadcasting, close up, closeup, communicate, communication, device, emergency, equipment, exhibition, grey, horn, inform, information, loud, louder, loudspeaker, media, megaphone, message, nobody, noise, object, portable, power, proclaim, propaganda, protest, public, reproducer, scream, services, shout, show, sound, speak, speaker, speech, symbol, voice, volume, warning,