eas em system library detection system 1.Detection range: 70cm - 100cm 2.Security system for library, book store, drug store eas em system, library detection systemModel: KB-EM3700 ... Frequency: 50HzDetection magnetic stripe : >6cm(including 6cm)Maximum detection Range: 100cmStandard detection Range: 80cmWork frequency: 2 KHzDetection height: 1500mm Eas Em System,library detection system