This product is an independent photoelectric smoke fire detection alarm (hereinafter referred to as the alarm), which is a household photoelectric smoke fire alarm that can detect smoke generated during a fire and send out an alarm signal in a timely manner. The alarm uses photoelectric smoke sensing devices and excellent production technology, with stable operation and beautiful appearance. The smoke sensing part uses the principle of infrared light refracted by particles in the smoke to detect fire. When the alarm detects smoke and reaches the alarm concentration, the alarm red light flashes and an alarm sounds. The alarm has a self-test function and a low battery prompt function, which meets the technical requirements of the national standard "Independent Smoke Fire Detection Alarm" and has stable and reliable performance. It is suitable for various places such as homes, schools, nursing homes, guesthouses, hotels, factories, etc., and is used to detect fire smoke generated by wood, cotton fabrics, plastics and hydrocarbons.