Black Flag Flying Insect Killer kills fast. It also kills bugs landing on treated surfaces for up to 12 weeks (excluding mosquitoes, wasps, hornets, and yellow jackets). This formula is effective against houseflies, fruit flies, mosquitoes, wasps, hornets, yellow jackets, gnats, skipper flies, and small flying moths. Can be used both indoors and outdoors. Contains a clean, fresh scent.