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125khz EM4100 Chip,Read Only,can't rewritable,If you need rewritable Keyfob,please contact with us all the chip has pre-programmed with Unique ID Number,but UID can't change,UID is pre-printed on the keyfob it's normal ID 125KHZ Keyfob,not H ID Keyfob,so it can work with H ID reader blue,black,Grey,Green,orange,red is available in stock, Manufacturer: YARONG