Ключевые слова: acoustic, advertisement, alert, alerting, amplify, announce, announcement, attention, audio, blue background, bold, broadcasting, broadcasting device, bullhorn, call, call to action, campaign, clarity, clear, communication, copy space, device, directional, equipment, gradient, graphic design, horn, iconic, influence, influential, information, loudspeaker, marketing, megaphone, message, persuasive, promotion, public, public address, public speaking, red, sound, speaker, speaking, speech, symbol, urgency, vibrant, visual communication, voice,