The Liphatech Mhouse is a refillable mouse poison bait station. Each package comes with 12 blocks that can be inserted into the station once the bait has been eaten. These stations are resistant to tampering by children and pets. The Mhouse refillable bait station is only to be used indoors. It is best placed along walls, in corners, by gnawed opening or in locations where house mice or their signs have been seen. It is recommended to maintain an uninterrupted supply of bait for at least 15 days or until signs of mouse activity has ceased. Please remove as much alternative food as possible when using this mouse poison so the rodents will eat this bait.