The PATROL series passive infrared detectors are equipped with original Fresnel lenses.

Fresnel Technologies Inc.'s multifocal optical lenses are made of "POLY IR®" and having the thickness of 0.39mm (0.015") enable the most effective collection of infrared energy from the detected area and exclusion of false alarms resulting from exposure to direct or reflected sunlight or car headlights.

The above lens' properties allow the installation of the PATROL series PIR detectors opposite windows.