A Kinetic Mystery! Can your brain explain what your senses experience?More than a mystery... it's an exercise in knowledge!Spin this unique top on its base and watch it continue for hours， sometimes days without stopping，The Science of Top Secret?The "Top Secret" consists of a spinning top with a radially oriented magnetic field and an associated base that houses a conductive coil. When the top spins past the center of the base， its changing magnetic field induces a current in the coil which momentarily opens the switch to the battery resulting in powering up the electromagnet. The electromagnet then delivers enough torque to the spinning top to allow it to speed up and spin away from the center.Since the electromagnet is only engaged when the top crosses near the center of the base， one 9 volt battery can last for over a week of continual use!NOTE: Do not put it in any place with magnetic field reference (TV/Computer etc.)This without batteryOpen the bottom cover， Power-on to produce the magnetic field power Then Turn the gyro exert your strength (Frist play may encounter the edge，try few more time ，it will OK ! )It's not just a mystery， this is a game of wisdom and knowledge ~ ~ When you are in a black base with rotating gyro， the gyro will not stop， can last for several hours Even a few days ~ ~ ~ Can you believe it?