Ключевые слова: amplifier, announcement, arm, attention, audio, background, bulb, bullhorn, business, businessman, caucasian, communication, concept, grunge, hand, holographic, idea, information, leadership, light, lightbulb, loud, loudhailer, loudspeaker, management, megaphone, message, news, shout, sign, sound, speaker, speech, symbol, warning, work, yellow,