By land, air and sea, these 3 easy put-together models give first time mechanics moving fun! Each vehicle has approx. 20 components to assemble, using the battery-operated power drill and screwdriver. Uses 2 "AA" batteries (not incl.). Assembled, each freewheeling vehicle has a moving part such as the turning periscope. Submarine is 6½" L. x 3¾" W. x 6" H. 62 pc. Set. Ages 3 yrs. +.