13.56 MHz UID Writable Rewritable Clone IC Smart Key Card, Compatible with MIFARE Classic 1K, RFID Rewritable for Access Control Key Tag Rewritable -20 PCS

["Working frequency is 13.56MHz. Compatible with all kinds of door access control system.","Support read, write and copy, over 100, 000 rewrite times.","Each card with a unique encrypted ID number, can be reprogrammed.","Fully compatible to MI-FARE Classic 1K,4-byte UID, 1K Byte memory, organized in 16 sectors of 4 blocks, compliant to ISO/IEC 14443A protocal.","Suitable for 13.56MHz card reader and reading distance is 0-10cm (0-4inch).20pcs UID Rewritable Card"]