The Learning Center Classroom Set comes with three timers of different colors to aid in color curriculum during the early years and for time management in color-coded classrooms. Each set also includes 3 Dry Erase Activity Cards to label the learning centers as well as a bi-fold guide filled with Classroom Time Management and Learning Center ideas. Strong magnets allow each Time Timer to be displayed on a markerboard, or any metallic material, but can also stand alone or hang on a wall. Each timer requires 2 AA/1.5V batteries (not included).