RESCUE!® Disposable Fly Trap. It catches up to 20,000 flies. Just add water and hang it. There is no messy rebating and it is completely disposable. No pesticides are used. It is for outdoor use around poultry, hogs, sheep, dairy and beef cattle areas, near a dog run or kennel, near garbage bins or dumpsters, a compost pile, a campsite, in a barn with good air ventilation. This attractant is comprised of food and feed ingredients and other food flavorings generally recognized as safe. The attractant dissolves and activates when water is added to the bag. Lured by the scent, flies enter the trap through the yellow top cap and drown in the water.