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The Seco Larm Enforcer Curtain Sensors are infrared photobeam sensors that provide a simple way to implement perimeter security for any area. When the infrared beam between the pair of sensors is broken, the sensors alert you by triggering your connected alarm or security system. These sensors are perfect for installation in windows, doorways, skylights, fence tops, garages and more. Suitable for indoor and outdoor perimeter security, the trigger is programmable for simultaneous breaking of any single or two adjacent beams, out of the pair s eight total beams. The design features rugged aluminum construction, and an anti tamper circuit for triggering an alarm if power is cut or the end cap is removed. No synchronizing wires are required and the LED alignment indicator makes installation easy. L brackets and mounting hardware are included.