MIFARE Card used for Contactless transmission of data and supplies energy with no battery needed. Its Operating distance is Up to 1 Meter depending on antenna geometry. Operating frequency is 13.56MHz and Data transfer speed is 106 kbit/s.
That brings the net storage capacity of these cards down to 752 bytes for MIFARE Classic with 1K memory, 3,440 bytes for MIFARE Classic with 4K memory, and 224 bytes for MIFARE Mini. It uses an NXP proprietary security protocol (Crypto-1) for authentication and ciphering.