new and high quality Made of high quality materials, sturdy This learning toy is suitable for curious children, allowing them to understand the driving principle of the motor and how the propeller rotates to generate wind. Cultivate children's practical abilities so that knowledge is no longer theoretical. Fine workmanship and excellent performance.<br><br>Can be used as a teaching experiment for wind power generation. Very suitable for cultivating students and children's hands-on ability. Propeller length: 18 cm Weight: about 4.8g Installation: positive and negative blades, can be fixed on the generator Bulb:5 USB cable:1M Color:As shown Material:Plastic+Metal<br><br>Package Contents: 1 * generator 1 * light bulb<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.