Boundary Detector that covers a building’s perimeter, Boundary Detector long, narrow detection area comes from the center point, covering both sides. Boundary Detector creates a multi-layered, horizontal barrier that detects intruders and sounds the alarm before they actually break in.Just one boundary detector can protect a long area, because it is installed in the center of the detection area and protects on both sides. makes you feel secure in knowing your building is well guarded.