A 13.56 MHz RFID NFC (Near Field Communication) card is a type of contactless smart card that operates in the high-frequency radio frequency identification (RFID) range. These cards are widely used for various applications, including access control, public transportation, payment systems, and identification.

Here’s a brief description of key features and aspects of 13.56 MHz RFID NFC cards:

1. Frequency: The card operates at a frequency of 13.56 megahertz (MHz). This frequency is a common standard for RFID and NFC applications.
2. Contactless Communication: RFID NFC cards use contactless communication, allowing them to exchange data with a reader device without physical contact. This is achieved through electromagnetic fields in close proximity (usually within a few centimeters).
3. Communication Protocol: The communication protocol for these cards is based on the ISO/IEC 14443 standard for proximity cards. This standard defines the physical characteristics and communication protocols for RFID cards operating at 13.56 MHz.
4. NFC Compatibility: NFC is a subset of RFID, and 13.56 MHz RFID cards are often compatible with NFC technology. NFC allows for two-way communication between devices, enabling applications like mobile payments, data transfer, and electronic ticketing.
5. Memory Capacity: The cards may have varying memory capacities, allowing them to store and transmit different amounts of data. This data can include information such as user credentials, access permissions, or financial details.
6. Security Features: 13.56 MHz RFID NFC cards often incorporate security features to protect the stored information. This can include encryption, authentication, and other measures to prevent unauthorized access or data interception.
7. Applications:
   • Access Control: Used in security systems for access to buildings, rooms, or secure areas.
   • Payment Systems: Used in contactless payment cards for transactions.
   • Transportation: Employed in contactless fare cards for public transportation.
   • Identification: Used for personal identification in various applications.
8. Form Factors: These cards come in various form factors, including credit card-sized cards, key fobs, and other shapes, depending on the specific application.
9. Read Range: The effective read range of these cards is typically short, typically within a few centimeters to a few inches. This limited range enhances security by requiring close proximity for communication.

Overall, 13.56 MHz RFID NFC cards are versatile and widely adopted for their convenience and security in various applications where contactless communication is desirable.