1[Advanced Technology] Single beam infrared beam alarm with waterproof cover design, fully sealed waterproof (fog), dust proof (insect proof) and other all weather integrated structure design, so that it can work normally in harsh environments. 2[Unique Design] Single beam alarm with high power transmitter, 90% sensitivity margin, high power infrared emission, receiver to tube, low power processing technology Lightningproof circuit design. High level of RFI, EMI immunity and unique digital filter circuit design. 3[Strong Anti Interference] Infrared beam alarm adopts hemispherical optical lens, and the beam is concentrated. Accurate and non scattering, with the automatic strong light adjustment system, it can effectively avoid the interference of strong light and car headlights. 4[Wide Applicability] Active infrared detectors can replace passive infrared intrusion detectors installed in small supermarkets, convenience stores, visitor entrances, and window entrances, and are also suitable for security systems such as schools, office buildings, dormitories, and homes. 5[Easy Installation] The best installation height should be greater than 20cm/7.9in, and the installation distance should not be less than 1m; the infrared protection device should be placed vertically and on the same horizontal line. With screws and other accessories, the installation is more convenient.