FBSHIELED Smoke Test conveniently tests the functional ability of a smoke detector. FBSHIELED Smoke Test can be sprayed while standing on the floor eliminating the need to climb ladders or chairs. FBSHIELED Smoke Test is ideal for residential or commercial detectors and is safe and easy to use. A short 3 second burst of FBSHIELED Smoke Test is all it takes. In addition, FBSHIELED Smoke checks for obstructions or debris which clog detector vents and prevent smoke from properly entering the sensing chamber. This important safety test is not accomplished by pushing a test button.