ID card belongs to read-only contactless IC card, also known as low-frequency card, it relies on the reader induction power supply and reads out the only card number stored in the chip EEPROM. The card number is written before the card is sealed, and can not be changed after the card is sealed. Like magnetic cards, ID cards only use "card number". In addition to card number, Carney has no secret function. Its "card number" is open and bare. Widely used in patrol system, attendance system, access control system, community property management, enterprise card system and other fields of radio frequency identification.
