Dry fog penetrates deep to kill bugs with no messy residue. The fumigating fog stays in the air during the 4-hour treatment, penetrating deep; going under furniture and appliances to kill bugs where they hide. Raid Max No Mess Dry Fogger can be used in kitchens, living areas, garages, attics, basements and pet areas. One unit treats a room up to 16′ X 20′ with an 8′ ceiling. 3 pack. Active ingredient: Permethrin.