Need a way to provide a visual to your students to help them maintain appropriate noise level during activities in the classroom? Try Bouncy Balls! This fun website is free, and has a built in microphone that is sensitive enough to reach the back of a large classroom. It detects shuffling feet, chair movement, and most importantly, talking. When noise level is low, the balls stay low on the screen. As the noise level rises the balls bounce to the middle of the screen. When noise is at a high level, the bouncy balls bounce high and all over the screen. Students love watching the balls respond to their voices. I found this when I did not have enough money to purchase a Yacker Traker.