Ключевые слова: 3d illustration, advertisement, advertising, alert, amplifier, announce, announcement, attention, audio, broadcast, broadcasting, bullhorn, business, call, communication, concept, design, element, emergency, equipment, flat, horn, illustration, loud, loudspeaker, marketing, media, megaphone, message, music, nobody, object, promotion, public, red, scream, shout, sign, single, sky, sound, speak, speaker, speech, symbol, voice, volume,