BX-80N creates a multi-layered, horizontal barrier that detects intruders and sounds the alarm before they actually break in. Just one BX-80N can protect a long area, because it is installed in the center of the detection area and protects on both sides. -Unique Dual-Side Detection Area of the BX-80N can protect both sides of windows when placed between them. 24m (80 ft.) long range detection. -Common causes of false alarms such as RFI and unwanted sunlight can be greatly reduced by patented Double Conductive Shielding. -Slim and stylish, the BX-80N will blend into any architecture. -Double Conductive Shielding -Easy Installation -Audible Alarm Function