The QXI series is a family of outdoor detectors providing 120° wide and 12 m (40 ft.) detection area.With its sleek and compact housing, the QX Infinity series fits any residential and commercial buildings without ruining its appearance.Sleek Compact with Quad-ElementThe newly equipped Quad-Element contributes not only to reliable detection performance with high tolerance to false alarms but also to be smaller than conventional outdoor detectors.You can access CR123A battery by simply opening the front cover. It's a dramatically time saving of every battery changing.Anti-Blocking FunctionAnti-blocking features of QXI-DT based on microwave technology which can detect intruders who try to mask the detector.Selectable Mounting Height & PatternHigh mount (2.2 - 2.7 m (7' 3" - 8'11")) or low mount (0.8 - 1.2 m (2' 7" - 4')) can be selected depending on the installation site.Multi Level PatternIt can create a proper detection area for high mount with intelligent AND logicPet Alley PatternAvailable for low mount to reduce risks of false alarms caused by pets with an alley which small animals can pass through without detections.