16-ounce Flying Insect Killer display. Keep your surroundings free of flying insects with the Bengal Flying Insect Killer 2. This 16-ounce aerosol spray provides a quick knockdown of flies, mosquitoes, gnats, small moths, and other flying pests. It also 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. It quickly kills 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. This product contains a 0.5% concentration of its active ingredient, Permethrin, an insecticide that is a powerful killing agent on insects.