The Protech by Hirsch SDI‑76M‑HS PIRAMID is an Ultra High Security indoor intrusion sensor engineered to meet the stringent requirements of U.S. government and military agencies. The HS Series enhances the standard PIRAMID dual‑technology platform by integrating multiple special high‑security features and upgraded supervision elements designed for mission‑critical detection. Using the PIRAMID architecture, the SDI‑76M‑HS combines Stereo Doppler microwave detection with a dual‑element passive infrared sensor, providing true dual‑technology discrimination. The M‑version HS sensors include a field‑configurable And Gate / Or Gate switch, allowing the installer to choose between maximum false‑alarm rejection (AND) or maximum sensitivity (OR), depending on security protocol and room geometry. Equipped with Lens H, the high‑density PIR module, the SDI‑76M‑HS provides detailed 50 x 50 ft. ft indoor coverage with dense multi‑zone resolution capable of detecting subtle movement—including crawling intruders. The HS platform delivers a Probability of Detection greater than 0.95 with a very low NAR/FAR, making it suitable for environments requiring elevated trust and continuous monitoring. For installations with fluorescent lighting, the SDI‑76M‑HS comes standard with the LFM (Fluorescent Light Filter Module) to suppress MW interference created by 120 Hz fluorescent flicker—ensuring sensor stability in high‑illumination indoor security applications.