Features: 1.It can effectively cultivate children's interest in learning can also be used for teaching purpose, more intuitive and easy to understand. 2.Good combination of fun and learning, mobilizes enthusiasm and improve practical ability of kids. 3.Round and smooth edge without burrs, no need to worry about scratching kid's hands. 4.The kit can help children exercise their finger flexibility, problem-solving skills and hands-on skills during the assembly process. 5.The assembly is simple, and the installation instructions are included, so you need to assemble it step by step, you can enjoy DIY fun. 6.Utilizing the principle of converting electric energy into kinesthetic energy, the worm is crawled after the circuit is connected. specification:Condition: 100% Brand New Item Type: DIY Model Material: PP Plastic Color: As Pictures Shown Power: 2 x AA (Not Included) Science and Education Toy Type: Physics Capacity Building: Mind and Hand Applicable Age: Junior (7-14 Years Old) PackageList:1 x Set of Parts2 x Plastic Foam Ball1 x Motor2 x Z Shaft1 x Battery Box1 x Bracket1 x Window Panel1 x Axle1 x Wool Strip1 x U Iron4 x Wheel4 x Wheel Cover