The hand generator material package needs to be assembled manually by yourself. In the process of DIY, you can not only get a sense of accomplishment, but also improve your practical ability. Mainly made of wood materials. When the handle is shaken quickly, the electricity generated will turn the bulb on. Features -Color:Assorted Color -Material:Wood -Size:15.00X12.00X8.50cm/5.89X4.72X3.34in -Note: The light bulb is random color. DIY hand generator toy, train your children observation capability, thinking and analytical skills. - Turn the handle and the electricity generated will turn the bulb on. The faster the handle is turned, the greater the power generated. - DIY assemble wooden projects for kids is happy and easy to learn, exercise your children practical ability. - The hand crank generator is easier for your child to learn basic mechanical principles and improve your child's hands-on ability. - Nice kids and students educational toy that you can have one and let your kids have a great fun from it. Package list: 2 x Sets of Generators