Baygon 24-Hr Roach Killer is a bait format cockroach insecticide that is designed to lure cockroaches into the bait station to be fed. Fed cockroaches will return to their nest and die. Other cockroaches from the nest that feed on the dead cockroaches will also be affected by the active ingredient and die. It is proven to be effective to reduce cockroach population in just 1 week and each bait can lasts up to 3 months.