I went to a workshop and the presenter used this to get our attention. I use it with my first graders, and it is amazing how well it works. All I say is "May I have your attention please?" with my hand raised. They have to raise their hand and stop talking. As soon as I say it, I start counting. They know that I should stop at 3, but sometimes I have to count longer. The quiet ones will get on to the people that made me go over 3. It works wonders!