The key anti-theft chip is actually RFID, in fact, is a contact-free swipe card system (there are also contact-type not discussed here), he is a radio frequency system, the electricity on the chip is obtained by radio frequency induction, microwave induction principle is used at high frequency, electromagnetic induction principle is used at low frequency, after induction, the chip sends its own information back.
At present, according to international standards, RFID has 900M, the distance is about 5 meters, the distance of 13M is about 20 centimeters, and the distance of 125K is about 1 centimeter. There is also a domestic standard of 433M.
125K is now only used on the car, other places are not used, is the original product, such as bus card and so on are 13M.
Chip anti-theft is in the traditional mechanical key inside, installed a physical chip, only in the chip and the host supporting the premise of the current vehicle can start normally, if not even open the ignition switch, the vehicle can not start normally.