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

Material:wood Specification:15*8.5*14.5*cm Whether can DIY:Yes Packaging:Other Whether multi-function:No Whether electric: Yes Ability to develop:Hands-on brain Science toys type: physics Colour: [Deluxe models] hand crank generator colour: [upgraded version] hand crank generator Colour: [retro version] hand crank generator Colour: [advanced version] hand crank generator Applicable age: juvenile (7-14 years old)