Ключевые слова: advertisement, alert, amplifier, announce, announcement, attention, audio, broadcasting, bullhorn, call, communicate, communication, concept, cut out, device, electronic, equipment, horn, isolated, loud, loudspeaker, mega, megaphone, message, no people, object, phone, portable, power, protest, public, shouting, single object, sound, speak, speaker, speech, voice, volume, white,