With the Time Timer range, easily answer the question "How much time is left?" The ingenious tool is designed to promote an efficient use of time, master the concept of time, encourage autonomy and independence, see elapsed time in a sound-sensitive environment, reduce stress between transitions, reduce the noise level in a classroom or gym, and more. Just move the coloured disc counter-clockwise to the desired time interval and the disc diminishes as time elapses until it disappears. The audible warning can be turned off. Silent quartz movement. Battery-operated (batteries not included).