Black Flag Flying Insect Killer Aerosol Spray, 18 Ounce KILLS FLYING INSECTS: Controls houseflies, fruit flies, mosquitoes and other listed insects. USE INDOORS OR OUTDOORS: Use as a surface spray or space spray. KILLS FAST: Controls listed insects on contact. KILLS UP TO 12 WEEKS: Keeps killing bugs landing on treated surfaces (excluding mosquitoes, wasps, hornets and yellowjackets). GUARANTEED: Guaranteed to work or your money back. See product label for details.