This is a microwave and dual passive infrared composite intrusion detector with auto masking technology for outdoor use. Using 8-bit high-speed microprocessor The direct calculation of 1 channel microwave and 2 channel 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 antielectro magnetic radio frequency interference ability. High reliability, error-free , beautiful appearance, is the ideal choice for residential, office, hotel, warehouse and other anti-theft systems.