Difference between Bullhorn and Megaphone

What is the difference between Bullhorn and Megaphone?

Bullhorn as a noun is a portable, usually hand-held, funnel-shaped device which electronically amplifies a person's natural voice toward a targeted direction. while Megaphone as a noun is a portable funnel-shaped device that is used to amplify a person's natural voice in a targeted direction.

We hope you now know whether to use Bullhorn or Megaphone in your sentence.