RFID (Radio Frequency Identification) wristbands work through a combination of technology and radio waves. Here's a simplified explanation of how they function:

RFID Tag: The wristband contains a small RFID tag, typically embedded in the wristband itself or attached to it as a separate component. This tag consists of a microchip and an antenna.

Reader Device: There's a reader device that emits radio waves and reads information from RFID tags. This reader device could be a handheld scanner, a fixed reader installed at specific locations, or even a smartphone with NFC (Near Field Communication) capability.

Radio Communication: When the RFID wristband comes within range of the reader device, the reader emits radio waves.

Powering the Tag: The radio waves from the reader device power the RFID tag on the wristband. This process is called "energizing" or "exciting" the tag.

Data Transmission: Once energized, the RFID tag sends back data stored on its microchip, such as a unique identifier code or other information programmed into the tag. This data is transmitted back to the reader device via radio waves.

Processing Information: The reader device receives the transmitted data and processes it. Depending on the application, the reader might use this information for various purposes, such as access control, payment processing, attendance tracking, inventory management, or identification.

Authentication or Action: Based on the data received from the RFID wristband, the reader device can then take appropriate action, such as granting access to a restricted area, recording attendance at an event, deducting funds from a prepaid account linked to the wristband, or updating inventory records.

Overall, RFID wristbands offer a convenient and efficient way to track and manage various activities and processes, thanks to their ability to wirelessly transmit data over short distances using radio waves.