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This is near field communication module based on RF module RC522. Its working frequency is 13.56MHz and you can read and write a 13.56MHz tag with this module. 8P dupont cable can be used to connect the module with Arduino board. Features: - Easy to use with the library for Arduino: RFIDMaster. - Operating voltage: 3.3V - Interface logic level: 3.3V - Operating current : 13-26mA - Idle current : 10-13mA - Sleep current: <80uA - Peak current: <50mA - Operating Frequency: 13.56MHz - Supported card types: mifare1 S50£¬ mifare1 S70 MIFARE Ultralight£¬ mifare Pro - Data transfer rate: maximum 10Mbit/s - Application: Smart home project£¬ Voice broadcast access control system£¬ Attendance punch card system.