I’d not want to have to crank it with my finger though (kidding…I think?). But my first thought was wouldn’t magnetic stuff like this have a problem messing with things like iPods, credit cards etc. or maybe other computer processing stuff in vehicles? It does look pretty interesting though…but loud.
Charybdis that’s right and why he first used his finger to get it started. Something has to make the occassional ‘boost’. I have a perpetual device given to me as a gift. It uses magnets to turn it back and forth BUT there has to be a battery to keep ‘knocking’ or kicking the magnets. When the battery dies, the motion stops.