Ключевые слова: amplifier, announce, announcement, attention, audio, broadcast, broadcasting, bullhorn, call, cloud, communicate, communication, concept, drark cloud, electric, electronic, emergency, green, horn, inform, lamp, light, loud, loudspeaker, megaphone, message, music, noise, object, palm, power, public, sound, speak, speaker, speech, spot, system, tree, voice, volume, warning, white,