The Mhouse Refillable Bait Station is a domestic-labeled rodenticide. Each bait station pack comes with 12 20g bait blocks. Each block contains 50 PPM Chlorophacinone, which was invented and patented by Liphatech. Bait station is resistant to tampering by children. For use only in indoor areas. Vitamin K1 is the Antidote. Place along walls, in corners, by gnawed openings, or concealed places between floors or walls, or in locations where house mice or their signs have been seen. Maintain an uninterrupted supply of fresh bait for at least 15 days or until signs of mouse activity cease. Remove as much alternative food as possible.