The RESCUE! Big Bag Fly Trap contains a fast-acting fly attractant that starts working as soon as you add water. Food and feed additives are combined with other dried ingredients to make the RESCUE! attractant. Lured by the scent flies enter through the yellow top cap and drown in the water. Unique Features & Benefits Controls flies around barns stables and animal pens Complete with fast-acting attractant Never touch the bait or flies Disposable when full Holds up to 40 000 flies (yes we counted them all!) EPA EST NO. 49407-WA-1 EPA REG No. 84565-2-49407 NO INTERNATIONAL Piccard Pets follows all applicable federal and state laws and regulations regarding the sale of the product. Piccard pets will not sell or ship to states in which the product is not registered as a general-use product.