Optex, the world's professional in Outdoor Security, introduces a new concept in outdoor perimeter security coverageth.The BX-100PLUS "BoundaryGard"® is a thin 2"x9" photoelectric detector for the outside surface of buildings which secures multiple doors and windows. BX-100PLUS offers more economical and excellent protection for roll-up doors and windows than many contacts or even audio discriminators. Attempts to smash glass or force an entry are detected before the attack happens. Even when windows or roll-up doors are opened for ventilating air, BX-100PLUS remains on guard.