Product Principle:

Each copper cymbal carries an opposite electric charge. The neutral metal ball has opposite charges induced on both sides relative to the copper cymbals, causing it to be attracted towards the closer cymbal. Upon contact, it acquires a similar charge and is repelled, pushing the ball towards the farther cymbal. This causes the ball to continuously swing back and forth, striking the copper cymbals.

Gameplay Points:

Gently rotate the generator crank handle at a steady speed and observe the small steel ball continuously colliding as it is repelled between the two copper cymbals due to their induced opposite electric charges.