It creates a greater awareness of elapsed time. Its concept is to visualize elapsed time in a more dramatic display than the familiar clocks. High color contrast makes it possible to know the remaining time without the need to focus on, or understand, the hands or numbers of the traditional clock face. It gives the child a chance to know what elapsed time looks or feels like. To set the timer move the hand to desired time interval. The red disc will diminish as time elapses until no red visible on the timer face and the hand is at 0. Time will elapse until the 60 minutes are up. Operates on one AA batteries(not included)