Motion Sensor Switch - Sensky BS019B Ceiling Mounted Occupancy Automatic Motion Detector DC 10V to 30V Human Body Infrared, Time Delay and Ambient Light Sensor Adjustable for Indoor DIY Lighting ABS+printed with copper base board Wide Range Ambient Light Sensor --- 0-300 LUX adjustable, the light sensor switch only works when the ambient light is lower than the setting value. Motion Activated Sensor --- Works by detecting human motion infrared rays. Time-delay Adjustable --- 2sec~30min adjustable, easy to set with a Phillips screwdriver. When the pir light switch receives the second induction signals after the first, it will re-calculate time once more. High Sensitivity Motion Detector --- This pir sensor Led light switch has 360 degree high-sensitivity with 5 meters max detection distance. Energy Saving and Reliable Quality --- Combined intelligent control and energy saving motion sensor switch, ideas for schools, libraries, restrooms, garage, hallway, corridors, conference rooms, etc. Last more than 500000 times. Friendly customer service with 1 Year Warranty.