[ALL-WEATHER DESIGN] single beam infrared beam alarm suitable for harsh environments with fog, dust, and . Fully sealed for reliable performance. [HIGH SENSITIVITY] 90% sensitivity margin with high power transmitter and receiver. Accurate detection with strong light adjustment system to avoid interference. [ANTI-INTERFERENCE] Hemispherical optical lens for concentrated beam. Unique digital filter circuit design for RFI, EMI immunity. Ideal for schools, homes, offices. [WIDE APPLICATION] Replace passive infrared detectors in supermarkets, convenience stores, schools, homes, and more. Easy installation with included accessories. [EASY INSTALLATION] Simple setup with receiver installed first, then transmitter. Vertical placement with screws included. Detailed manual for convenient usage., Manufacturer: Jelquix