The Protech by Hirsch SDI‑77XL‑MW is a high‑security, microwave‑only outdoor intrusion sensor engineered for applications requiring dependable long‑range detection without the need for dual‑technology filtering. Utilizing PROTECH’s proprietary Stereo Doppler microwave technology, the SDI‑77XL‑MW precisely measures the amount of physical movement needed to trigger an alarm, enabling exceptional discrimination against vibration, wind motion, random disturbances, and other nuisance triggers. With a 100 ft × 60 ft medium‑angle pattern, the sensor delivers robust coverage suited for wide‑area protection zones, industrial perimeters, correctional facilities, and other mission‑critical outdoor environments. A rugged metal housing, weather shroud, and full EMI/RFI immunity ensure long‑term performance in harsh conditions. Installation is supported using standard PIRAMID mounting hardware, including the PH‑6L wall bracket and PH‑4 / PH‑4A universal pole‑mount systems.