loud hailer

美 [laʊd ˈheɪlər]英 [laʊd ˈheɪlə]
  • 网络扩音器;大声公;话筒
loud hailerloud hailer

noun

1
a portable loudspeaker with built-in microphone and amplifier
Synonym: bullhorn loud-hailer

数据来源:WordNet