Guaranteed for effective results, this 16-oz. aerosol flying insect killer provides a quick knockdown of flies, mosquitoes, gnats, small moths, and other flying pests and proficiently kills mosquitoes that may carry West Nile and Zika viruses. It's made for indoor and outdoor use and controls residential, industrial, and garden insects for up to 4 weeks, quickly killing them on contact. With a highly effective water-based formula, the spray doesn't leave behind oily, messy residues, so you can use it on most indoor surfaces without worry. It's easy to use - simply cover any exposed food and utensils and close all doors and windows prior to spraying, spray upward in short bursts toward the center of the room in a sweeping motion, and then sweep up and discard the fallen dead insects. This flying insect killer spray contains a 0.5% concentration of its active ingredient, Permethrin, an insecticide that is a powerful killing agent on insects.