General description The 10pcs/Set Smart RFID Block Writable IC UID Card is an updated version that offers better quality and enhanced protection for the UID interchangeable chip. It supports the ISO14443A protocol, making it a reliable choice for access control systems. Technical specifications Material: High quality PVC Protocol: ISO14443A Writable: Block0 of the card is writable Usage Write your earned UID on the writable block0 of the card. Copy UID from mf s50 card. Other information Lightweight design for maximum durability. Features stable and secure data transmission. Includes anti-fraud security measures such as mutual challenge and response authentication, data encryption, and message authentication to protect the system from tampering.