Blue Line Gen 2 Pir 40 Ft. By 40 Ft. The Blue Line Gen2 PIR Motion Detector (ISC-BPR2) use two Fresnel lenses designed to produce sharply focused images throughout the field of view providing superior response to intruders. These lenses provide a high density (77 zone) 7-layer pattern, and the selectable lookdown lens provides an additional three lookdown zones. Easy installation and flexible mounting options provide state-of-the-art detection. The pet-friendly generates alarm signals for human intruders without generating false alarm signals for pets.