WDA817B CeilingMounted 360 Motion Detector Key benefits Complete 360 degree coverage for reliable detection of movement across a room. Reduces false alarms using enhanced signal analysis and accuracy processing technology. Stable operation in electrically noisy environments thanks to 4SMT technology. Dual NC alarm outputs for straightforward integration with alarm systems. Compact, durable ABS housing suited to continuous use in varied environments. What it does This ceilingmounted infrared motion detector provides fullroom monitoring with an 8 meter detection range. It continuously scans a full 360 degree area and triggers an alarm output when unauthorized motion is detected. The detector uses enhanced signal analysis and accuracy processing to minimize false triggers. Who it is for Homeowners, business operators, and security professionals who need reliable zone coverage and easy compatibility with existing alarm systems in residential complexes, retail outlets, and industrial sites. Main features Model: WDA817B Coverage: 360 degree detection Detection range: up to 8 meters Outputs: dual NC alarm outputs for system integration Technology: 4SMT for stable operation in electromagnetic environments Housing: ABS construction for durability Size: diameter approximately 82 mm / 3.2 inch Power: operating voltage 9 to 16 V Current consumption: less than or equal to 18 mA at 12 V Operating temperature: 10 to +55 C Installation and placement Designed for ceiling mounting to maximize coverage and reduce blind spots. locations include hallways, entryways, lobbies, corridors, and warehouse ceilings. Compatible with most alarm systems that accept NC alarm inputs. Practical use scenarios Residential hallway: ceiling installation provides continuous monitoring of corridors and common areas to detect unauthorized movement. Retail store: mounted above a sales floor or storeroom to monitor customer and staff movement and to integrate with a central alarm system. Warehouse or loading area: large area coverage from a single ceiling sensor reduces the number of units required while maintaining reliable motion detection. What is included 1 x infrared motion sensor (ceilingmounted) Notes Allow 1 to 2 cm tolerance due to manual measurement. Actual item color may vary slightly from images depending on monitor settings.