When the group is too loud, you get their attention by saying, loudly "EYES!!"
They respond: "OPEN MA'AM"
I said : "EARS"
They said "LISTENING MA'AM" (We practice this many times during the first day of school, and before you know it, the first couple of times, you don't even have to go to the EARS part. They're already quiet and listening)
It works great!!
Of course, if a Male Teacher/Principal/Counselor wants to use it, they respond
with OPEN SIR, and LISTENING SIR
KELLY