The MIFARE Classic 1K with 1 Kbytes EEPROM read/write memory and is compatible with existing MIFARE infrastructures. Operating in accordance with ISO 14443A, MIFARE 1K functions at a distance of up to 10 cm with true anti-collision properties and without the need for a battery. 

The MIFARE classic family is the pioneer and front runner in contactless smart card ICs operating in the 13.56 MHz frequency range with read/write capability. 

Applications:
Original NXP Mifare 1k S50 Cards are widely used in Enterprise / campus card, bus card, highway fees, parking lot management, residential management, and so on.