Victor Rodent Killer is a powerful rodenticide that effectively eliminates a variety of rodent pests including rats, mice, and meadow voles*. The palatable bait formula, flavored with fish, attracts rodents and keeps them coming back until they have ingested a lethal dose. Many rodenticides are only capable of eliminating indoor infestations. However, Victor Rodent Killer features a weather-resistant formula, allowing it to be used in dry or wet areas both indoors and out. To use, place the bait balls in tamper-resistant bait stations in areas where rodents are common. The 4 lb bag ensures you have enough ammo in your arsenal to rid yourself of an infestation.