Combat Roach bait is formulated with food that attracts both small and large roaches, plus the powerful insecticide, Hydramethylnon. This long-lasting formula kills common cockroaches of all sizes, including American and German roaches, eliminating the need to buy different baits. These easy-to-use, no-mess baits need no activation. Simply place them down and relax as they continuously target the source of the problem day and night.