Accurately monitor motion in a 40 x 40' area with the VX Infinity Series VXI-RDAM Dual PIR and Microwave Motion Detector from Optex. This motion detector uses dual PIR motion sensors and digital double layer detection to help reduce the number of false alarms by requiring an object to pass through the field of view of both sensor beams. Super Multidimensional Analysis logic helps to reduce false alarms caused by climate changes and tree movement. This motion detector is battery-powered for quick and simple installation.