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.