Ключевые слова: alert, amp, amplification, amplifier, announce, announcement, audio, blue, broadcast, broadcasting, bunch, calling, column, communication, emit, equipment, information, loud, loudspeaker, megaphone, message, old, outdoor, pillar, pole, post, power, public, rusty, shout, sound, soundsystem, speak, speaker, speakers, system, talk, tell, voice, volume, warning,