Ключевые слова: alarm, alert, announce, announcement, audio, background, banner, black, broadcast, broadcasting, business, button, communicate, communication, computer, concept, conceptual, design, geometric, icon, illustration, isolated, loud, loudspeaker, media, megaphone, message, mp3, music, mute, noise, notify, siren, sound, speaker, symbol, technology, voice, volume, wave, white,