This Yacker Tracker signal light and sound meter is a must-have for anyone who needs to control noise levels. With its adjustable light and sound settings, it is perfect for use in classrooms, libraries, and other quiet spaces. The Yacker Tracker is designed to help children understand when it is too loud, and to encourage them to be more mindful of their behavior. It is also a great tool for teachers and parents to use to help reinforce good behavior and create a more peaceful environment. This Yacker Tracker is the original model and is made by AGI. It is recommended for children aged 4 and up, but is also suitable for older age ranges. Use it to help create a more peaceful environment in your classroom, library, or home.