For retailing enterprise that implement open-shelf sale, shoplifting is the main reason of decreasing profit. America Retailing loss prevention investigation report from Florida University shows that the loss from shoplifting has up to 10.2 Billion USD in American retailing in 2003, the whole average loss rate is 1.7%. Electronic Article Surveillance (EAS) is a kind of electronic anti shoplifting system that can decrease shoplifting when retailing enterprise implement open-shelf sale, so increase sales and profit. EAS system consists of electronic sensors, deactivator system and label or tag. Electronic sensor that are located at store exits, a transmitter sends a unique signal at certain frequencies to a receiver, which creates a "surveillance area" at a store exit, when a product with an active label or hard tag is moved past a sensor, the sensor sets off an alarm. Radio Frequency (RF) is the most popular technology in EAS system, it adopts Radio Frequency as Transmit and Receive signal, the detection frequency range is 7.x~8.xMHz. The advantage of RF EAS system is low cost, good price VS performance and all kinds of label are current. As the first company that introduces EAS system into China, Promatic gains customer's satisfaction because of advanced technology and high product quality. In 1999, Promatic is the first one who researched digital intelligent EAS system successfully in China and leaded anti shoplifting system into Digital age. At present, Promatic has researched the second generation DSP EAS Sensor, technology advantages have been surpassed the whole trade. Promatic's serials of digital EAS system have been approved as powerful weapon of anti shoplifting in retailing enterprises.