RFID (radio frequency identification card) is also called contactless IC card or proximity chip card. It consists of a chip and an antenna that are sealed in a card made of standard PVC, ABS PET material or other material without any exposed parts. The read-write process is fulfilled by the radio wave between IC coupled resonator circuits and reader. The RF protocols are ISO/IEC14443 (A /B /C…/F /G), ISO/IEC15693 and ISO/IEC18000-3 etc.

Low frequency: 125 - 134 KHz

The RFID cards complying with these protocols are called RFID LF cards, RFID HF cards and RFID UHF cards accordingly. Sometimes a RFID composite card sealed with both LF and HF chip/antenna together can work on both LF and HF frequencies.

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