The MIFARE DESFire is based on a core similar to SmartMX, with more hardware and software security features than MIFARE Classic. It comes pre-programmed with the general purpose MIFARE DESFire operating system which offers a simple directory structure and files.
MIFARE DESFire uses a protocol compliant with ISO/IEC 14443-4. The card is based on an 8051 processor with 3DES/DES crypto accelerator, making very fast transactions possible.
The maximal read/write distance between card and reader is 10 cm (4 inches), but actual distance depends on the field power generated by the reader and its antenna size.