Tag Type 4 provides a flexible file system with different files and access types including data integrity checks and encryption options as some of the main features. It supports an ISO/IEC 7816-4 compliant command (APDU) handling of the native MIFARE DESFire EV1 command as well as some ISO/IEC 7816-4 defined APDU like SELECT FILE, READ BINARY and UPDATE BINARY. It is fully compatible with ISO 14443-A and ISO 14443-B standards. Tags are pre-configured at manufacture to be either read and re-writable, or read-only. Memory availability is variable, and it can be up to 32 KBytes per service. Communication speed is up to 424 kbit/s.