Smoke Test Brand Smoke Detector Testers, 2.5 oz, ClearSimulates smoke to provide a true, functional test for smoke detectors Aerosol spray extends user reach up to 6', 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 No harmful residue, plastic safe, non staining Contains no Class I Ozone Depleting Chemicals