The FLX-A-DAM FlipX Series Advanced Indoor Dual-Tech PIR Detector from Optex is a wired indoor PIR detector with anti-masking. It features a pyroelectric element and rotatable lens. By removing the case and flipping the lens 180°, you can adjust the detection pattern from 85 to just 5°, for coverage from large open spaces to long narrow passages or windows. The IR anti-masking function will generate a trouble signal when the detector is masked. As part of the FlipX series, the FLX-A-DAM is ideal for indoor environments, ranging from residential to high-end commercial.