If your pets are always setting of your alarm system, try this motion sensor containing special technology to differentiate between humans and pets. This sensor contains TWO PIR motion sensors plus a special lens to create the greatest immunity against false alarms caused by pets. Can differentiate between pets under 2.5 up to 85 lbs and humans, and can be set to operate in a "normal" environment (containing a pet lower than 1.2) or a "harsh" environment (containing larger or multiple pets). Circuit board can be moved up and down to adjust coverage. LED on the unit can be turned on or off. 100 degree coverage at 40 ft. Five-year warranty. Mounts with included screws.