Scientific Experiment Hand-cranked Generator Diy Students Technology Small Production Children's Creative Invention Diy Material Package

Material:Wood Specification:150*85*120mm Whether can DIY:Yes Packaging:Other Whether multi-function:Yes Whether electric: Yes Ability to develop:Hands-on brain Science toys type: physics Applicable age:Junior (7-14 years old) 2:Handmade diy small production 1:Science experiment small invention 3:Children's creative simple hand-crank generator