This simple chart may be so helpful to a student needing help with coping/ processing. This can be considered a differentiation for a student with challenging behavior and can offer support to him/her without rewards/ punishments! From Ross Greene skills
Chatter tracker--I like this as a reminder to students about the voice level to have during specific times of the day. I wouldn't use this exact phrasing, and I would actually make a stop light to "light up" as a reference for the kids.