This is a megaphone.

A student gives me a megaphone. As he hands it to me he says ” Don’t hit the siren.”

I’m thinking, ” What siren?”  as I hit the siren button.

The siren is fully twice the decibel level of the fire alarm system in the building. People start to pour out of their classrooms.

He unhits the siren button.

It has its uses.  Great for getting someone’s attention.