It's an energy automatic ceiling PIR lamp, it can identify day and night. It adopts infrared detector, IC and SMD technology. PRODUCT INFORMATION ... and SMD technology, when someone enter its detecting range, the infrared detector turnon the lamp, after he leave its range, the lamp ... temperature: -10~+40°CWorking humidity: ≤93%RHWeight: about 0.477kg Infrared Motion Sensor ceiling light