Convenient， easy， and safe product to test the functional ability of a smoke detector. Smoke Test also checks for obstructions or debris which clog detector vents and prevent smoke from properly entering the sensing chamber. Simulates smoke to provide a true， functional test for smoke detectors. Aerosol spray extends user reach up to 6 feet， allows testing to be done while standing safely on the floor. Convenient package makes testing easy， increasing the likelihood that detectors will be tested on a regular basis. Ideal for commercial and residential use.