Build Unforgettable Memories Our electric gear building block toys are the perfect tool for promoting stronger parent-child relationships. Enjoy countless hours of family bonding as you assemble and create together Promotes Mechanics This electric gear building block toy set comes complete with various building blocks and track pieces, as well as rotating gears and moving parts. Its transformable design encourages children to think creatively and use their engineering skills to build unique creations that will spark their curiosity and ingenuity Packing List: 83 pieces (including 1 electric mainboard) or 97 pieces (including 1 electric mainboard + rail car) or 166 pieces (including 1 electric mainboard ) or 180 pieces (including 2 electric mainboards + rail car) or 249 pieces (including 3 electric mainboards) or 263 pieces (including 3 electric mainboards + rail car)