only 2 coils, 2 magnets, 2 leds, really simple
but how does it work ?
www.youtube.com/watch?v=jKFTAobM-l0
www.youtube.com/watch?v=H3UpZ6w9x5A
www.youtube.com/watch?v=TNUwf8z4C-M
Batteries in the coil cores (Bolts are fake, don't go all the way through). Known for some time.