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Megaphones are also known as loudhailers or bullhorns, which are very handy and have versatile purposes. An amplified speaker and a microphone are combined to increase or amplify a human voice. Manufacturers offer variety megaphones a safety equipment that are handheld, with a shoulder strap and megaphones with keys. These loudhailers send the amplified voice to long distances and they attribute conical loudspeakers. The voice, on the principle of sound waves, is concerted and focused in a cone. It's a non - electric gadget. Most of the bullhorns have voice control systems. Some megaphones have a whistle or a siren. For convenience people use shoulder strap megaphones because they are portable. Megaphones are useful to gather attention or crowd controlling. College cheerleaders to amplify their cheer in their college functions use cheerleading megaphones. Law enforcement officers, movie directors and military drill teams also use megaphones. These loudhailers are used for long speeches too.
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