Kills up to one year. Kills non-stop for up to 12 months. With food roaches prefer. Child-resistant baits. How Combat Works: Roaches enter bait station and eat the bait. Roaches take the bait back to the nest. Roaches share the bait, killing other roaches and destroying the nest. Results may be affected by the number of roaches, the cleanliness of the area and the use of other roach control measures throughout the structure. Made in the USA.