Each chip has a unique UID number, but the UID cannot be changed or rewritten，Default button: FF FF FF FF FF FF. 【About Application】-These RFID cards work with KABA,SAFLOK,MIWA AND ONITY LOCKS,also compatible with RC522 and PN532 readers.

Providing enough storage space, you can quickly write the information you want. 【About Material】 Made of durable waterproof PVC material, the round PVC NFC cards can be placed outdoors or near water without the risk of losing functionality.