Clear 21mm Diameter RFID Tag

RFID (Radio frequency identity) is a wireless technology, and with the use of RFID modules, you can control entry, authenticate users, and more. Each tag transmits a unique 40 bit code that is pre-programmed and subsequently recognised by the receiver module. They work with any reader supporting EM-4001 compliant tags. Measures 21mm diameter, less than 1mm thick.