The ID IC white card contains a chip called RFID inside. When we hold a card containing an RFID chip and pass it through a card reader, the electromagnetic waves emitted by the card reader will start reading the information inside the card. The information inside can not only be read, but also written and modified. Therefore, the chip card is not only a key, but alsoIt's an electronic ID card.

Because as long as your personal data is written into the chip, the card reader can know who is entering and exiting.

The same technology is also used for anti-theft chips and so on in shopping malls.