Ключевые слова: advertisement, alert, amplifier, announce, attention, audio, broadcasting, bullhorn, call, communication, concept, cutout, device, electronic, emergency, equipment, horn, information, isolated, loud, loudspeaker, marketing, media, megaphone, message, microphone, music, news, noise, object, opinion, portable, power, proclaim, promotion, propaganda, public, scream, shout, signal, social, sound, speaker, speech, support, symbol, talk, voice, volume, warning,