Features: 1.Purpose machine can be assembled into a light version. 2.The parts are assembled by themselves, and the connection of the rocker is connected by the square column. 3.It is more secure and more stable. Please insert some deep. So that it can work in high performance. 4.Children can make their own brain assembly, which enhances the child's care and patience. 5.Installation is not complicated, but it requires some care and patience. And it is with playability. specification:Item Type: Lighting- Accelerated hand shake generator Material: ABS plastic Packing: Ziplock bag Toy Type: Physics Science Suitable Age: 7-14 years old PackageList:1 x Motor Bracket1 x Motor1 x Connector5 x Square Column1 x Axle1 x Crank2 x Blue Gear1 x Orange Gear1 x Angle Iron1 x Base Plate1Pack x Kit1 x Screwdriver