Ключевые слова: advertisement, advertising, alert, amplifier, announce, announcement, attention, audio, background, broadcast, bullhorn, call, communicate, communication, device, electronic, emergency, equipment, information, loud, loudspeaker, megaphone, message, news, noise, pink, portable, power, proclaim, propaganda, protest, public, red, shout, shouting, sound, speak, speaker, talking, technology, top, voice, warning, white,