Fog disappears quickly and leaves no residue. Odorless synthetic Pyrethroid. Kills mosquitoes, flies, gnats, hornets, wasp and other insects. Use with propane and electric foggers. For yards, patios, around swimming pools, drive-in and barns. Will work with all Burgess and Black Flag foggers. Lasts up to 6 hours. Active Ingredient: 2 percent Resmethrin.