Target Pest = fleas Ideal for large-area treatment - one fogger treats 750 sq. feet. Also well-suited to cluttered areas like basements and garages. Contains Precor IGR to prevent flea reinfestations for up to seven months, plus Permethrin for quick knockdown of adult fleas. Water-based, no-odor formulation won't stain or leave an unsightly residue. How It Works The Permethrin in Precor Plus Fogger immediately kills adult fleas, while Precor IGR prevents pre-adult fleas from creating new infestations of breeding, biting adults. Precor IGR molecules penetrate down to the hard-to-reach places where pre-adult fleas hide - especially carpet and upholstery fibers, rugs, drapes, pet bedding and floor cracks.