nothing
I used a megaphone to get the students attention.
I'll forego the megaphone. Your megaphone could use a fresh coat of paint.
you just did. Another sentence is: The man used the megaphone to speak to the massive crowd.
Pass me the megaphone.He yelled into the megaphone for the robber to give up.
In order to be heard down at the back, he used a megaphone to talk through.
Rudy Vallee
No, a megaphone is a device used to amplify sound, particularly human speech. It does not measure light or speed.
Megaphone is a noun.
Megaphone - band - was created in 2004.
Megaphone Team was created in 2003.
The Braindead Megaphone has 272 pages.
There are several places where a person can buy a siren or megaphone that are used in live soccer games. Large sporting goods stores such as Dick's Sporting Goods have the megaphones.