Fast Action Mouse Killer - Twin Pack Fast Action Mouse Killer is a unique, highly palatable and effective rodenticide product, which kills mice within 24 hours. There is sufficient bait to kill up to about 100 mice. The bait is held securely in pre-baited boxes making it a child and pet-friendly system. Contains Alphachloralose. Features and Benefits Kills mice within 24 hours Children and pet-friendly One box kills up to 50 mice No bait handling required For indoor use Made in the UK How to Use Use as soon as infestation occurs. Always read the label and product information before use. Use biocides safely. Where to Use Ideal locations for use are where mice have been seen running, such as against walls, under cupboards, behind furniture in loft spaces, garages, and sheds.