Gender: Boys Warning: DIY Science Toys Scientific experiment toys exercise children's practical ability.DIY small toys cultivate innovative ability.Put education in fun, cultivate scientific knowledge; Age of application: over 3 years old Type of toy: intellectual development Principle: The closed coil rotates in the magnetic field,and the inductive current is generated by electromagnetic induction,so the principle of its generation is battery induction. Methods of assembly: Step 1:stick four small squares to the four corners of the board with white glue. :glue the frame with white glue.The glue is not dry at this time.so we need to take it lightly and put it lightly. Step 3:connect the whole frame with glue.Wait for 15-20 minutes until glue to solidify. Step 4:after glue solidification, assemble shaft with yellow sleeve clamp,small white rotating axis toward the inside. Step 5:install swing arm and drive wheel,and use yellow sleeve clamp. Step 6:tie the motor bracket under the skew