Convenient & Practical: The infrared motion sensor is -saving automatic lighting switch, it adopts high sensitivity detector, integrate circuit and SMT. With wide detection range made up of up and down, left and right service field. (Horizontal 180°, vertical 60°, Max 12m detecting distance.) Working Principle: It utilizes human motion infrared rays as control signal sources, when one enters the detection field, it the controlled load at once. Time-delay Adjustable: It can be set according to your desire, the minimum is 5sec, the maximum is 10min. Identify Day and Night Automatically: The ambient light of PIR sensor switch could be adjusted according to your desire: when turn to SUN (max), it work day and night, when turn it to MOON (min), it only work in the ambient light less than 3LUX. As for adjustment, please refer to testing way. Wide Applications: It's widely used in intelligent lighting, easy installation on doorways, corridors, elevators, balconies, bathrooms, mirrors, wardrobes, cabinets, warehouses, basements, garages, etc.