Description: You can understand simple mechanical principles through this hand-cranked generator, it also can exercise hands-on ability, use your imagination to create your own toys. This is a perfect DIY experimental toy that can cultivate children's interest in physics and science, and can also help children improve their hands-on skills. It is made of high-quality wood and electronic components material. The length of this product after assembly is 15cm, the width is 8.5cm and the height is 13cm. It can be regarded as an ideal gift for your kids. Item Name: Educational Toys Material: Wood, Electronic Components Features: Intellectual Development, Hands-on Ability, Self-assembled Size Details: LxWxH: 15cm x 8.5cm x 13cm/5.91" x 3.35" x 5.12"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Set of Educational Toys