Kills on contact. Fast acting formula! Guaranteed to work or your money back. Kills for up to 3 months (On non-porous surfaces; excluding spiders, fleas, and carpenter, pharaoh and fire ants). For indoor & outdoor use. Leaves no oily residue. Questions or Comments? Call 1-800-917-5431 or visit our website at www.hotshot.com. Guaranteed: If you are not satisfied with this product for any reason, send your written request for a refund to the address below, together with the dated store receipt showing the price you paid. Please allow 6-8 weeks for processing. Contains No CFCs or other ozone depleting substances. Federal regulations prohibits CFC propellants in aerosols.