Turn over the Frog Timer and watch two different colors of liquids slide down each of the wheels. It takes approximately less than one minute (depending on room temperature) to completely empty into the lower portion. Great prop to keep on a science table for the children to tip, turn and watch as the liquid drips down. Frog Timer can also be used for teacher or child stress/relaxation, quiet time toy, refocusing prop, anxiety prop, or a timer. The Frog Liquid Timer is 5" tall.