The digital timer is a countdown timer and stopwatch in one. Great for math exercises, science experiments, timed tests, games, classroom management, and more! Sticks to whiteboards or any magnetically receptive surface.Details:Available in multiple colors2.125" x 3.375" x 0.25" (5.4cm x 8.57cm x 0.635cm)3 timersIncludes AG13 button-cell battery for each timerThe digital timer is a countdown timer and stopwatch in oneGreat for math exercises, science experiments, timed tests, games, classroom management, and moreSticks to whiteboards or any magnetically receptive surfaceFor ages 6 and up