Selontra Rodent Bait provides a quick colony kill and controls the infestation of a variety of rodent species within seven days. The shortened bait program requires less bait, and the active ingredient, Cholecalciferol 0.08%, allows rodents to eat only enough for a lethal dose, leaving the remainder for the rest of the colony. Selontra is effective against anti-coagulant rodents and its palatability has been proven, even when desirable food sources are available. This product is durable and holds up even in the toughest environments. It does not melt in hot, humid temperatures, even as high as 177 degrees, or lose its potency in temperatures as low as 0 degrees. Selontra Rodent Bait is great for you, but bad for rats and mice!