Like you would use a noise meter in class, this is an English-o-Meter. I laminated this and put on a clip board. I cut it out and added 3M velcro-like strips to each face. My K-4 students hold this in their laps and monitor whether or not their classmates are speaking Spanish or English during class. If they hear English, they move the smiley face. They move it back and forth. If we stay on the red sad face, we lose our game that class period.