Worry-free Service: If you encounter any quality problems or non-human damage that prevents you from using it, please contact us. 10PCS RFID Proximity ID Door Entry Access Control ... – Grandado Chip: Built-in Ultralight C MF0ICU2 chip, working Frequency: 13., 56 MHz, with 192-bytes usable memory, you can quickly write the information you want. Real 13.56MHz UID Changeable Keyfobs Token MF NFC Tag Rewritable RFID Writable Access Control Key.jpg Q90.jpg Mifare Ultralight C MF0ICU2 Key Fobs 50 Pack NFC Ultralight C - Contactless Ticket IC MF0ICU2 13.56Mhz Key Fob Blue Color (Pack Of 10) (50 PF Mifare Ultralight C NFC Keyfobs 13.56MHz Access Control Tags Compatible: Compatible with Newly upgraded SAFLOK, KABA, ONITY and SALTO Locks. This mifare ULC keyfob MF0ICU2 can be used on most access control security systems. Some access control/door lock systems (e.g. SAFLOK, KABA) require a special key format and cannot directly reuse cards from other systems 32-bit user programmable OTP area. Anti-cloning support by unique 7-byte serial number for each device.