M1 Chip operates at 13.56MHz wireless frequency,according to the ISO14443A standard,and contains 1K bytes of read/write memory,but UID can't change,uid is not rewritable
These RFID cards work with KABA,SAFLOK,MIWA AND ONITY LOCKS. But they can NOT work with HID,Salto and Assa Abloy Locks/System,Amiibo and Tagmo,etc.
All cards are pre-programmed with a unique ID(4 Byte UID). The UID is NOT changeable, factory default key: FF FF FF FF FF FF