Make sure your smoke alarms are functioning properly by testing them with this CRC Smoke Detector Spray. It simulates smoke to provide you with a true working test without using any harmful ozone-depleting chemicals. With an extended reach of up to 6 this aerosol spray for smoke detector testing allows the user to do the testing while safely standing on the floor. It also checks for obstructions which clog detector vents and prevent smoke from properly entering the sensing chamber. This smoke alarm test spray comes in a convenient 6-oz aerosol can that makes testing your smoke detectors easy to do on a regular basis.