My comment on the video is “pending approval” and I suspect this faker will not approve it so I’m posting it here. 🙂
That’s an ordinary rare earth magnet (button shaped one). See ebay. They have a north and a south. The bar magnet is weakly magnetized metal. The button shaped magnet is attracted to the bar magnet either way because it’s attraction for the metal is stronger than the weak magnetism in the bar magnet. Same goes for the compass. Voltage is being applied to the two nails from inside the block of wood in order to propel the motor. That’s the voltage he’s measuring. Google “simple electric motor”.