Time Timer® is committed to developing products that help people of all ages and levels manage their time, whether in the classroom, at home, or at work. The Learning Centre Classroom Set includes the Time Timer® Original Medium and is available in a convenient three-timer pack. The kit contains three timers in red, yellow, and blue, specially designed to accompany color-coded teaching programs in preschool education and for effective time management in color-coded classrooms. Silent operation with an optional audible alert at the end of the allotted time. Magnetic back and foldable feet. Each Time Timer® requires 2 AA/1.5V batteries (not included).