The Knock Down Duo Insecticide Dispenser Kit comes with one can of domestic MAX Flying Insect Killer and a BVT dispenser to deliver continuous protection from pests. This automatic insecticide dispenser is controlled by a timer to deliver continual protection from pests. Equipped with a pre-spray warning light and an LED display to show battery life, this insecticide dispenser can protect a room for up to 60 days.