Features: * Kills Warfarin resistant Norway rats and house mice * Rats and mice may consume a lethal dose in one feeding with first dead rodents appearing four or five days after feeding begins * For use in and around agricultural buildings only * Contains the active ingredients: Brodifacoum and Bitrex What"s In The Box: * Neogen 116362 Havoc XT Rodent Bait Blocks - 8 lb.