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0 Sector 0 block can be modified UID Changeable MF 1k S50 Smart IC Card RFID 13.56MHz ISO14443A Induction This card works the same as normal MF cards. Works exactly like the MF S50, with 16 Sectors and 4 Blocks each Sector, but the Sector 0 Block 0 known as Manufacturers Block where the Chip UID is stored, can be re programmed to any UID you wish. You need to use the professional software and card reader to modify and copy UID of the card.If you have not professional software,and card reader. Please do not buy if you can't understand words above! Popular applications: Loyalty / Ticketing / Identification / Access Control