This product is a photoelectric smoke detector, which works according to the principle of sensing smoke particles. Adopting unique structural design and photoelectric signal processing technology, it has the functions of dust prevention, insect prevention, anti-external light interference and so on, which ensures the stability of the product from the design. This product has a good response to visible smoke generated by slow smoldering or bright burning. It is suitable for smoke monitoring in indoor environments such as residential buildings, shopping malls, hotels and warehouses.