Xuehai Library Equipment Company was created to provide solutions to the security needs of the independent retailer. We have more than 21 year's experiences in manufacturing EAS (EM) system. By combining high quality loss prevention solution, Our main products as follows EAS (EM) Accessories, Library Security System, EM System, EAS System, Anti-shop lifting System, EM Tag, Security Strips and Barcode Reader. Digital Detector applies in numeral technology, adopting the computer chip to control, and model design, using 14.28KHZ low frequency to check and measure the multiple frequency points.