The Protech by Hirsch SDI-76XL-MIL PIRAMID is a MIL-spec outdoor dual technology sensor engineered for the most demanding high-security applications. Approved by the USAF for Protection Level 1 Nuclear & Below, this sensor delivers a wide-angle 50 ft. x 50 ft. (15m x 15m) volumetric detection pattern using Lens H (H 90°, V 60°), combining Protech's proprietary Stereo Doppler microwave technology with a dual-element passive infrared sensor in an "And Gate" configuration — both technologies must activate simultaneously to trigger an alarm. With enhanced detection parameters optimized for slow-moving, fast-moving, and crawling intruders, the SDI-76XL-MIL achieves a probability of detection (POD) greater than 0.95 while maintaining an industry-leading false alarm rate of just 1 per unit per year. The all-metal RFI/EMI-shielded housing with integrated weather shroud operates from 10.5 to 28 VDC across a wide temperature range of -40°F to +158°F (-40°C to +70°C). Ideal for military bases, nuclear facilities, correctional institutions, and critical infrastructure requiring the highest level of perimeter protection.