Being developed based on China Fudan 13.56MHz transponder IC, HF RFID Module SL018 can be regarded as the cheapest MIFARE® reader/writer in the world market. In spite of its low price, SL018 can support all the functions of MIFARE Classic® 1K, MIFARE Classic® 4K and MIFARE Ultralight®. It 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 in one PCB.