Once freed from its specially fabricated foil package, the exposure to air activates the key ingredients in Fruit Fly Bar Pro. Like an air freshener, the time released vapor fills the air and every crack and crevice of an approximate 200 cubic foot space. Any listed insect in this space is immediately affected, infected and will die within 24 hours. Fruit Fly Bar Pro is not a fly trap nor is it a form of sticky paper, but a silent, odorless, colorless killer that attacks and treats the problem area at its source. Other products such as traps, fluorescent lights, fly paper and home-made traps simply attract the targeted insect from the area they are reproducing, but fail to eliminate the problem altogether. Our fly strips target those hard to reach reproducing areas or nests with a deep penetrating vapor that kills, prevents and protects for up to 4 months!