Assertion: electric megaphone | /r/CapableOf | use electrically-powered amplifier
Facets:
value: to amplify the voice
type: PURPOSE
Source sentences:
text: Since the 1960s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone, which uses a microphone, an electrically-powered amplifier and a folded horn loudspeaker to amplify the voice.