Works by helping to keep bugs out of the home and killing the other bugs that cross the barrier. Automatic trigger helps you lay down a consistent barrier of bug protection inside and outside the house at key insect entry points. Kills ants, beetles, silverfish, flies, ticks, spiders, sowbugs, fleas, palmetto bugs, centipedes, waterbugs, crickets and roaches. Keeps killing German cockroaches for up to 12 months after you spray it. Gives immediate results when you spray directly. Active Ingredient: Deltamethrin.