Mosquito Magnet Octenol Biting Insect Attractant, 3 Count EPA registered secondary attractant Mimics human breath which lures biting insects to the Mosquito Magnet trap and away from you and your family Recommended attractant for those who live in northern & coastal regions Replace every 21 days Increases catch rates up to 10 times! Attracts most mosquito species, including salt marsh, as well as no-see-ums and black flies