【Wired Motion Detector】Brand new and high quality, used for high security outdoor systems. Extremely reliable and no false alarm, for maximum security. 【Dual PIR Sensor】It has the advanced functions of recognizing human body movement, composite detection performance is more stable and reliable. 【Pet Immunity】Can make an accurate judgment to the intruder or other interference and avoid the false alarm of a pet from 5 kg (12 m) to 35 kg (9 m). 【Good Optical Filters】Out of 99% stray light, special anti-UV (UV) lens, reducing the false alarm rate to the extreme.