Simple and easy-to-use trays require no advance preparation; just set them out and wait. They are potent enough for large infestations. Perfect for hard-to-reach areas; just slide them in under the refrigerator or couch, beneath the sink or inside the closet. Effective against a variety of rodents, including warfarin-resistant house mice and Norway rats. Works efficiently; mice and rats may receive a lethal dose within the first feeding. Rodent Control Product Type: Poison; Application: Indoor; Target: Mice; Rats; Active Ingredient: Brodifacoum.