• Kit Contents: RC522 13.56 MHz NFC Reader Module 13.56 MHz NFC Card 13.56 MHz NFC Keychain Headers Specifications: Operating Frequency: 13.56 MHz Operating Current: 13-26mA Sleep Current: 80uA Communication Protocol: SPI Supported Cards: mifare1 S50, mifare1 S70 mifare ultralight, mifare pro and mifare desfire Card Sizes: 40x60mm