UID card block 0 (UID's block) can be modified arbitrarily. Block 0 directly with normal mif read-write device modification. Card of the default password for 12 F,FFFFFFFFFFFF. RFID smart nfc tags Repeated write 13.56MHZ IC keyfob can repeated UID changeable CARDS Block 0 sector zero Copy Clone 1K S50. Application: Applicable to sauna, swimming pool, patrol, tree, animal, entrance guard, bus, car park, identity certificate, attendance management, ticket, one-card payment, product identification, etc. Colour: white Material: ABS Package Contents: 20 x RFID NFC card Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. UID card block 0 (UID's block) can be modified arbitrarily. Block 0 directly with normal mif read-write device modification. Card of the default password for 12 F,FFFFFFFFFFFF. RFID smart nfc tags Repeated write 13.56MHZ IC keyfob can repeated UID changeable CARDS Block 0 sector zero Copy Clone 1K S50. Application: Applicable to sauna, swimming pool, patrol, tree, animal, entrance guard, bus, car park, identity certificate, attendance management, ticket, one-card payment, product identification, etc.