Strictly for use during your department mask drills. The Smoke Canister generates 500,000 cubic feet of dense white smoke for five to six minutes burning time. Smells and looks like fire smoke but will not leave odors or residue to damage clothing or walls. Irritating to discourage laxity in training exercise. Could be hazardous when used indoors without self-contained breathing apparatus. Ship. wt. 4 lbs.