Kills on contact with no lingering chemical odor and will keep killing bugs for up to 4 weeks. Available in an easy-to-use aerosol can. This insecticide uses broad spray patterns for good surface coverage. Use Raid Ant & Roach Killer directly on roaches themselves, as well as in their hiding places. Also kills ants, spiders, crickets, silverfish, and waterbugs. 17.5 oz (ounce) aerosol.