Ключевые слова: advertisement, alert, amplification, amplifier, announce, announcement, attention, audible, audio, background, broadcasting, bullhorn, call, christmas, communication, cut, cutout, device, electric, electronic, emergency, hat, holy, horn, icon, isolated, isometric, loud, loudspeaker, mega, megaphone, nobody, object, phone, portable, power, public, red, render, single, sound, speak, speaker, symbol, tube, voice, volume,