The RFID card contains an electronic circuit that when the tag is placed near or within the range of the RFID reader, the magnetic field produced by the reader activates the tag.
Next, the tag continuously sends data through radio pulses.
Finally, the data is received by the code reader and sent to a computer, microcontroller or other systems for processing.
These cards are printable and you can print your design on it using special printers

RFID card applications with 125KHZ frequency
access control
Document tracking
Intelligent animal husbandry or animal tracking systems
RFID in construction: tracking tool, pipe tracking
Jewelry identification
RFID in hospital and health care
Patient follow-up
Follow up of hospital equipment
RFID payment systems
Personal identification and tracking
Access control
Time and presence
Race timing (running, bike, vehicle)
RFID and supply chain RFID transportation
Tracking of shipping containers
Vehicle identification and access level determination
Telephone payment systems