M5Stack RFID2 Unit Chip | Enhanced RFID Capabilities: Powered by the WS1850S chip, RFID2 supports reading, writing, recognition, and authorization of RF cards, operating at 13.56 MHz for seamless contactless data exchange. Fast and Efficient Communication: Supports I2C data rates of up to 3400 Kbit/s in high-speed mode, ensuring rapid data transfer and improved system responsiveness. Multiple Protocol Support: Compatible with ISO14443A, MIFARE, and NTAG protocols, making it a versatile choice for various RFID applications. Compact and Durable Design: Measures 48 × 24 × 8 mm with mounting holes, RFID2 is compact yet durable, ideal for integration into smart devices and systems. Wide Range of Applications: Suitable for smart home access control, vehicle management, smart transportation, and smart bookshelves. Operating frequency: 13.56 MHz I2C data rate: Fast mode: up to 400 Kbit/s; High-speed mode: up to 3400 Kbit/s Receiver buffer: 64 bytes Supported protocols: ISO14443A, MIFARE, NTAG Working temperature: -20 °C to +85 °C Data storage retention: Greater than 10 years Reading distance: Up to 20 mm Development platform support: Arduino, UIFlow (Blockly, Python) 2 × LEGO-compatible mounting holes Package Contents: 1 × RFID Unit Note: Package includes only the RFID Unit. Other accessories are not included. Color: As shown in product image Material: ABS Lighting conditions and display settings may cause slight color variation. Actual product appearance may vary slightly due to manufacturing batches — this does not affect functionality.