Product Summary of Wired Outdoor PIR Motion Detector: Wired Outdoor PIR Detector adopts the advanced A/D processing technology and Micro-processing recognition technology. It works by detecting the infrared radiation heat from the human body. The detector can be used in different environment as it adopts double infrared sensor together with special filter lens and automatic temperature compensation technology. It has the advantages of false-alarm free and easy installation and widely used in families, schools, banks and so on. www.karassnsecurity.com