The glass break detector is keeping a plane glass-area within a maximum radius of 2 m under surveillance. The glass break detector must be pasted at the pane of glass with glueset from LOCTITE (Accessories). A surveillance of structure-glass is not possible. Also it is not allowed to use the glassbreak-detector on wired glass or security-glass, because the wire netting and the plastic-foil are damping the mechanical oscillations. The GB-5100 detectors with relay output and LED indication can be used in smaller installations (1-5 pcs). Secondary Packaging: 25 Units