For secure testing of optical or photoelectrical smoke detectors without the need of additional testing instruments. Safe and easy to use, gentle on electronic instruments, evaporation without residues, can content lasts for up to 150 applications, and free of silicone. Shake can before use and spray test spray for about 5 seconds and with a distance of approx. 30 cm towards the smoke detector. The functioning of the smoke detector has to be tested on a regular basis, and recommended testing period is two inspections per year.