The baits are formulated with food that specifically attracts German roaches and other small roaches, plus a powerful insecticide, Fipronil, which starts killing within hours. Like all Combat products, these baits target the nest to eliminate the source of the problem. Combat Max baits are easy-to-use, child-resistant, need no activation, and can be used anywhere you see roaches. Simply place them down for up to six months of effective roach control.