It’s the sound of all two dozen physicists who read the title of this post and began furiously attacking their keyboards to rant about how perpetual motion machines are “literally impossible” and yadda yadda…
This is what’s called an “apparent” perpetual motion machine because it appears to be a perpetual motion machine and only nerds care that it’s really not.
First of all, this is a kit, not a product. You get to build this thing. It’s fun.
Once built, place it in a well-lit area so the discreet solar panel can power the gear wheel, slowly bringing marbles up to the top for a ride down the twisty slide!
When placed outside, the machine sends a marble up the wheel about once a minute. Indoor light will power the machine at a slower rate.