Dual-purpose Machine Design---This hand crank generator is a dual-purpose machine, which can be assembled into a light version or assembled into a fan version. More Secure & More Stable---This hand crank generator set is more secure and more stable. Please insert some deep. So that it can work in high performance. Train Child's Care & Patience---This hand crank generator set is a great educational toy, children can make their own brain assembly, which enhances the child's care and patience. Easy to Install---This hand crank generator with playability, and the installation is not complicated, but it requires some care and patience. Qualitative Materials--This hand crank generator set is mainly made of high quality ABS plastic material, which is solid, safe, non-toxic and not easy to deform.