The Optex SX-360Z 360° Ceiling Mount Indoor Passive Infrared Detector with Zoom Function and highly dense, triple-element detection pattern provides 360° of detection performance at any ceiling height up to 16' high. By simply twisting the unit's domed lens, the detection pattern can be easily adjusted at any installation height, thereby making it a flexible ceiling detector. The 276 dense zones provide a 60' diameter detection area at any installation height from 8 to 16' with no dead spots. This, combined with its compact design, makes the detector suitable for a variety of large or small, residential or commercial applications.