The RFID Reader Module is a specialized RFID Card Reader designed to read codes from 125 KHz cards, compatible with both read-only tags and read/write cards. This module is a favorite among Arduino users as it can read 125 KHz EM4100 series RFID cards. With its easy-to-use interface, support for external antennas, and compact design, the RFID Reader Module offers fast decoding times of less than 100ms via its UART interface. It is suitable for various applications, including office/home security, personal identification, access control, anti-forgery, interactive toys, and production control systems.