Tomcat Mouse Killer Refillable Station Advanced Formula kills mice with advanced formulation bait that is more appetizing to house mice (vs. Tomcat Mouse Killer Child & Dog Resistant, Refillable Station EPA Reg. No. 90780-9). One poison block can kill up to 12 mice (based on no-choice laboratory testing). Designed for mice, this bait station is resistant to tampering by children and dogs. It also features a clear lid for easy monitoring, so you can easily check and refill bait blocks as needed. Weather resistant, and can be used indoors and out. Place in an area where rodent activity has been noticed, such as basements, garages, behind appliances, inside cabinets, or home exteriors. After feeding on the bait, the rodent will likely go back into hiding then die elsewhere within a few days. Maintain a continuous supply of bait until rodent activity comes to an end.