Amdro Solid Ant Bait Stations, 4-Pack are designed to effectively eliminate entire ant colonies with a slow-acting poison that allows worker ants to carry the bait back to their nest. These bait stations are highly effective against a variety of ant species including Argentine, Black Carpenter, Cornfield, Little Black, Odorous House, and Pavement Ants. Suitable for both indoor and outdoor use, they target grease, sweet-eating, and fire ants using the active ingredient Hydramethylnon. For results, place the stations in cabinets, under sinks, and behind appliances. Indoor stations should be replaced after three months of use, while outdoor stations need every six weeks. Model Number: