Optex, the world leader in Outdoor Security, introduces a new concept in outdoor perimeter protection. The BX-100PLUS "BoundaryGard"® is a slim 2"x9" photoelectric detector for the exterior surface of buildings which protects multiple doors and windows. BX-100PLUS provides more economical and superior protection for roll-up doors and windows than multiple contacts or audio discriminators. Attempts to break glass or force entry are detected before the attack. Even when windows or roll-up doors are left open for ventilation, BX-100PLUS stays on guard.