The Flowtron Mosquito Attractant makes your insect killer more effective in killing certain mosquitoes and biting flies. The attractant remains effective for up to 400 hours of bug killer use, and it will work hard to keep mosquitoes and other pests away so you can enjoy the outdoors. There is one cartridge per package, designed for use with electronic insect killers. Flowtron"s whole line of insect killing products are designed for the effective control of unsanitary insect pests without costly and hazardous chemicals. Flowtron"s bug killers and accessories are dependable, clean, safe, and effective, so you won"t have to give the insect problem another thought.