Ключевые слова: advertisement, advertising, air, alert, announce, announcement, attention, audio, background, broadcast, bullhorn, business, caution, communicate, communication, device, emergency, equipment, falling, fly, flying, information, isolated, levitate, levitation, life, light, loud, loudspeaker, marketing, media, mega, megaphone, message, motion, news, object, one, portable, promotion, public, red, scream, security, shadow, shout, sound, speak, speaker, speech, symbol, turquoise, voice, volume, warning, white, wireless, work,