Aerosol Smoke Detector Tester Feature :  Merk : CRC Size : 2.5 Oz (70.5g) Aerosol spray extends user reach up to 6-feet allows testing  to be done while standing safely on the floor No harmful residue, plastic safe and non-staining UL listed Contains no class I or class II ozone depleting chemicals Checks for obstructions or debris which clog detector vents