4 years & up. The Original Judy Clock provides a simple and fun learning tool for telling time featuring moveable hands, visible functioning gears, and an elapsed time bezel. Visible functioning gears maintain correct hour hand and minute hand relationships. Use this clock as a resource to introduce children to concepts of time, motion, and cause/effect. Clock comes permanently assembled. Includes a teacher's guide. Clock measures 12.75" diameter x 13.5" H.