This 16 oz flying insect killer delivers fast knockdown of flies, mosquitoes, gnats, small moths and other flying pests, including mosquitoes that may carry West Nile and Zika viruses. Designed for both indoor and outdoor use, it controls insects in residential, industrial and garden settings for up to 4 weeks. Its water based formula kills pests on contact without leaving oily or messy residue, making it safe for most indoor surfaces. with a 0.5% concentration of permethrin, a powerful insecticide for killing flying insects.