... .Library Book Security System 4.EM Detection Gate System em library security gate, em library security system Model: SSLT-EM-9188 NEWDescriptions:* Material: High ... : Acousto-optic alarm. * Can be compatible with all kinds of EM labels and strips such as 3M,Meto, ect. * Microprocessor control ... 1024KHz Dimension 1500mm x 400mm x 25mm Weight 20kg/pce EM Book Anti-theft System