Being developed based on NXP s transponder IC, HF RFID Module SL025B is a MIFARE OEM reader/writer. It supports MIFARE Classic® 1K, MIFARE Classic® 4K, MIFARE Ultralight® and is applicable for 13.56MHz. This embedded module does auto Real-time detecting tag which moves into or out of detective range and reports through one output pin s logic level. In addition, it integrates all necessary components and antenna into one PCB. The external Micro-controller can work with SL025B to read/write MIFARE cards by simple serial communication commands.