Zodiac Household Flea Spray contains a powerful and effective insecticide which kills the adult fleas that are present in the short term, and a long acting insect growth regulator which prevents flea eggs and larvae from maturing into adults- this breaks the life cycle and gives your home continuous protection for 12 months when used as directed. The short acting insecticide will also kill other insects on contact.Zodiac Household flea spray leaves no bad odour, no sticky residue and will not stain soft furnishings.