Fascinations Top Secret Fascinations designs product to illustrate many magical aspects of our world Spin this unique top on its base and watch it continue for hours, sometimes days without stopping The "Top Secret" consists of a spinning top with a radically oriented magnetic field and an associated base that houses a conductive coil Its changing magnetic field induces a current in the coil which momentarily opens the switch to the battery resulting in powering up the electromagnet One 9 volt battery can last for over a week of continual use