This is the motorized construction set that lets future engineers build a brightly colored carousel that lights up and plays music. It consists of over 1,400 pieces including colorful metal “girders”, nuts, bolts, gears, music box, and a battery that supplies power to the LEDs. Unlike simple building block sets, this construction kit provides young adults with a fun yet challenging introduction into engineering. The completed merry-go-round is operated with a turn handle that causes the ride to rotate and play music. Includes two button cell batteries. Ages 14 and up. Assembled 14" H x 10 3/4" Diameter. (4 lbs.)