Induction. The key anti-theft chip is a non-contact card swiping system, is a radio frequency system, the electricity on the chip is obtained by radio frequency induction, the microwave induction principle is used at high frequency, the electromagnetic induction principle is used at low frequency, and the information is sent back to the chip after induction. The sensor distance of the chip is generally more than 5 meters inside. When the key anti-theft chip reads the secret information of the key, it can get the history information of the anti-theft system.