Passive Infrared (PIR) Passive infrared sensors work by measuring incoming infrared energy. Infrared energy is released when heat is created. Humans and animals both release infrared energy. Passive infrared sensors (sometimes called pyro electric detectors) detect this energy and measure it against previous, or standard, levels. In this manner, they can monitor changes in the environment. These are used in the motion detectors that are commonly used for security reasons by businesses and residential home owners. Features MCU Processing Low Voltage Indication Wireless/Wired Signal Transmission Adapt SMT and RFI interference Technology Auto temperature compensation reducing false alarm Unique wiring, easy for installation Strong ability to meet different environment High EMI immunity Microwave detection range adjustable Distinguish in break signal and interference signal by using artificial intelligence technology.