The Protech by Hirsch SDI-77XL2-CP PIRAMID XL2 delivers precision narrow-angle perimeter detection across a focused 125 ft. x 20 ft. (38 m x 6 m) coverage pattern, purpose-built for long, narrow corridors, fence lines, and confined passageways. Equipped with the Lens C-Pet module, this dual-technology sensor combines Protech's proprietary Stereo Doppler microwave with passive infrared in an "And Gate" configuration — both technologies must activate simultaneously to generate an alarm — virtually eliminating false alarms from birds, small animals, and household pets. The C-Pet lens features a modified lower detection curtain that provides pet immunity while maintaining full human-size target detection across the entire 125-foot range. Powered by 10 to 28 VDC, the SDI-77XL2-CP operates reliably in extreme conditions from -40°F to +158°F with 0–100% relative humidity, housed in a rugged IP65-rated metal enclosure with integrated weather shroud. Advanced signal processing delivers immunity to vegetation movement, vibration, and temperature fluctuations, making it ideal for utilities, airports, data centers, equipment lots and other high-value sites requiring reliable narrow-beam volumetric protection.