Ключевые слова: advertisement, alarm, alert, amplifier, announce, announcement, attention, audio, boat, broadcast, bullhorn, calling, closeup, concept, cruise, detail, device, electronic, emergency, equipment, ferry, horn, information, loud, loudspeaker, marine, maritime, megaphone, message, noise, object, outdoor, paint, powerful, public, security, ship, signal, siren, sound, speak, speaker, speech, symbol, system, vessel, voice, wall, warning, white,