The Protech by Hirsch SDI‑76XL‑DIR is an outdoor dual‑technology intrusion sensor that combines Stereo Doppler microwave and passive infrared detection in an AND‑gated configuration, ensuring only true intrusion events trigger alarms. Designed for medium‑range pedestrian and intruder detection, the DIR version features a three‑mode direction‑control switch—Approach‑Only, Recede‑Only, or Both—allowing installers to tailor the sensor to the expected direction of movement. Rugged construction, precise aiming controls, and broad environmental immunity make the SDI‑76XL‑DIR a reliable solution for controlled walkways, facility perimeters, and strategic approach zones.