Aleph Photoelectric Beam Sensors, specifically the ABT-60 model, which are dual-beam infrared detectors designed for perimeter security systems. Key Features and Description: Functionality: These sensors are used to create an invisible fence, detecting intruders by simultaneously breaking both the upper and lower infrared beams, triggering an alarm system. Outdoor/Indoor Use: The ABT-60 model has an outdoor detection range of 60 meters and an indoor range of 180 meters. It's built with an IP65 rating, making it suitable for outdoor use and resistant to elements like fog and frost due to smart heating technology. Adjustability: The sensors feature adjustable sensitivity and up-and-down optical lens adjustments for precise alignment and adaptation to various environments. Outputs: They offer NO/NC (Normally Open/Normally Closed) relay outputs for integration with alarm control panels. Applications: Beyond security systems, these detectors can also be utilized in fire alarm systems, automated lighting and HVAC syste