This is a microwave and passive infrared composite intrusion detector with masking technology for outdoor use. Using 8-bit high-speed microprocessor The direct calculation of microwave and passive infrared intrusion signals is carried out, bipolar detection, automatic temperature compensation, digital signal sensitivity adjustment technology, etc., will cause many possibilities The factors of false positives are effectively filtered out, photoelectric solid-state relay design, with strong anti-electro magnetic radio frequency interference ability. High reliability, error-free alarm , beautiful appearance, is the ideal choice for residential, office, hotel, warehouse and other anti-theft systems.