Ключевые слова: advertisement, alert, announcement, attention, authority, background, broadcast, business, call, campaign, communication, concept, control, device, equipment, expression, focus, hand, holding, information, isolated, loudspeaker, man, marketing, media, megaphone, message, noise, notice, power, promotion, protest, rally, shout, signal, sound, speaker, speech, statement, technology, voice, volume, white,