Deadfast mouse & rat killer plus block is an innovative rodenticide that kills in a single dose and is highly effective. The block formulation is designed to withstand tough outdoor conditions. This rodenticide kills in a single dose and is highly effective even on high infestations. The block formulation is designed to withstand high moisture conditions, dust and a wide temperature range, ideal for demanding conditions and outdoor placing. Features: Kills in a single dose, No known resistance, All weather bait blocks, Ridge cut blocks to encourage gnawing. For use indoors and outdoors around buildings.