Ключевые слова: acoustic, alert, amplify, announcement, attention, audio, black, broadcasting, call to action, clarity, command, communication, declare, device, directional, emergency, emergency services, equipment, event, glossy, hearing, horizontal, influence, information, isolated, leadership, loudspeaker, media, megaphone, megaphone icon, message, minimalism, noise, persuasive, power, protest, public address, public speaking, rally, shiny, signal, simplicity, sound, speaker, speaking, technology, urgency, voice, volume, white background,