The stand alone photoelectric smoke alarm is made of high quality components, advanced electronic technology and sophisticated technology. It has microprocessor control which makes our alarm high reliable, and less false alarm. Once the smoke concentration reaches the alarm setting value, the detector will issue an audible and visual alarm signal to remind you to take effective measures immediately. And, it can link with other devices to eliminate dangerous situations and effectively avoid the occurrence of vicious accidents such as fire, explosion and poisoning.