It is an contactless reader module based on the MFRC522 from NXP B.V.. Communication Via Serial makes it simple and easy-using. Compatible with ISO/IEC 14443 A/MIFARE cards it supports all variants of the MIFARE Mini MIFARE 1K MIFARE 4K MIFARE Ultralight MIFARE DESFire EV1 and MIFARE Plus RF identification protocols and the operating distance in Read/Write mode is up to 40 mm. - Power supply 3.3 V/5V - Support ISO/IEC 14443 A/MIFARE - Support Mifare1 S50 Mifare1 S70 Mifare UltraLight Mifare Pro Mifare Desfire - Operating distance in Read/Write mode up to 40 mm - FIFO buffer handles 64 byte send and receive - SPI interface - Working current: 13~26mA - Idle current: 10~13mA - Working temperature: -25 ~ 85’C - Size: 71.00mm x 40.90mm