Ключевые слова: advertising, alert, amplifier, announce, announcement, audio, broadcast, broadcasting, bullhorn, communicate, communication, danger, declare, demonstration, emergency, horn, important, information, loudspeakers, marketing, megaphone, message, multiple, network, news, notification, politics, promotion, pronunciation, propaganda, protest, public, public address, rally, report, row, shout, sound, speak, speaker, speech, system, talk, transmit, urgent, utter, voice, volume, warning, yell,