In my class, there are many activities, projects and lessons going on all at once. In order to allow each student the freedom to move about as needed, yet stay on task; I use a rainstick to gain the attention of the class back to me. When I need to speak to the class as a whole or have the groups change activities, all I have to do is turn the rainstick over. The students automatically freeze and turn their attention toward me. It's the best thing I've ever done to maintain classroom management.