Excellent for hard-to-reach areas like crawl spaces and attics. Knock Down Total Release Fumigator Insecticide eliminates insect pests with highly effective 4 percent Pyrethrin from Chrysanthemum flowers. The formula combats a variety of insects including bed bugs, ants, fleas and crickets. Keep out of reach of children and pets. Use only in well-ventilated areas. Not for use in dwelling areas.