Maxforce Fly Spot Bait provides an unobtrusive way to control house flies both indoors and outdoors, including non-food areas of commercial food-handling establishments and animal facilities. Powerful attractants combine with the active ingredient imidacloprid, which kills flies in 60 seconds or less. This product provides immediate results with a long residual: up to 6 weeks indoors, and up to 30 days outdoors.