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loudspeaker /ˈlaʊdˌspiːkɚ/  

  • noun
    plural -ers
    [count] :a device that is used to make sound (such as music or a person's voice) louder and to send it out so that many people can hear it in a public space
    He made an announcement over/on the loudspeaker. = He made an announcement using the loudspeaker.