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. 1 x Motor Bracket1 x Motor1 x Connector5 x Square Column 1 x Axle 1 x Crank 2 x Blue Gear1 x Orange Gear1 x Angle Iron 1 x Base Plate1Pack x Kit1 x Screwdriver Item Type: Lighting- Accelerated hand shake generatorMaterial: ABS plasticPacking: Ziplock bagToy Type: Physics ScienceSuitable Age: 7-14 years old