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Support RFID reading and writing, P2P communication with peers, NFC with Android phone. Support I2C, SPI and HSU (High Speed UART), easy to change between those modes. RFID read/write supports: Mifare 1k, 4k, Ultralight, and DESFire cards ISO / IEC 14443-4 cards such as CD97BX, CD light, Desfire, P5CN072 (SMX) Innovision Jewel cards such as IRT5001 paper FeliCa cards such as RCS_860 and RCS_854 . Up to 5cm~7cm reading distance. On-board level shifter, Standard 5V TTL for I2C and UART, 3.3V TTL SPI. Small dimension and easy to embed into your project. Arduino compatible.