The Protech by Hirsch SDI‑76‑G Indoor PIRAMID Sensor is a high‑density, dual‑technology intrusion detector designed for demanding indoor security environments requiring maximum detection detail and sensitivity. Using PROTECH’s advanced Stereo Doppler microwave technology combined with a dual‑element passive infrared (PIR) system, the SDI‑76‑G requires both technologies to activate simultaneously before generating an alarm—significantly improving nuisance‑alarm rejection compared to single‑technology detectors. Equipped with Lens H, the high‑density optical module, the SDI‑76‑G provides a 75 ft × 75 ft coverage pattern with 50+ PIR protection zones and an 88‑degree field of view, enabling high‑resolution detection of subtle movement, including crawling intruders or small‑scale motion that may be missed by standard lenses. The SDI‑76‑G also includes Balanced Temperature Compensation, maintaining stable performance as ambient temperatures rise into the 90s, and offers full digital adjustment for range, sensitivity, and immunity settings. Rugged all‑metal housing, walk‑test LEDs, and optional FF‑3 fluorescent filter compatibility further enhance reliability in commercial, industrial, and high‑security indoor installations.