MIFARE DESFire EV2 4K Blank White Cards are ideal for a range of applications including advanced public transportation, access management, closed loop micropayment, campus and student ID cards and loyalty. Mifare DESFire EV2 4K are 760 micron and CR80 (standard credit card size). They operate at a frequency of 13.56MHz and include read/write capabilities and ISO/IEC 14443 type A compliance. They benefit from a unique 7 byte UID and on-chip backup management system.