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They are often used at some sporting events, protests, rallies and crowd control. Their benefits are that they do not require a sound system, or a microphone, and the device is hand-held and portable.
In Wagner's opera Siegfried, the voice of the dragon Fafnir was to be sung by a bass, offstage rear, using an acoustic megaphone.
Most megaphones used today are electronic, with a small battery powered amplifier.