Protech by Hirsch presents the Lens-B is a replacement PIR (Passive Infrared) lens engineered for PIRAMID motion sensors requiring medium-angle detection coverage. This precision optic restores full sensor functionality when the original PIR lens becomes damaged, scratched, or optically degraded. Designed for 100ft. x 35ft. detection patterns, Lens B delivers focused coverage ideal for corridors, pathways, and narrow detection zones. Simply swap out the damaged lens to return your PIRAMID sensor to peak performance without replacing the entire unit. An essential spare part for maintaining reliable perimeter and intrusion detection systems.