50Pcs 125Khz Writable RFID Proximity Keyfobs, Blue T5577 Fob Tag Rewritable RFID
Note: You cannot add them to RFID locks directly. You must write data into them by a 125kHz RFID card writer before use. Function: Working with 125kHz frequency, support read and rewrite, can be used to copy UID code from other RFID ID card.