Johnson's 4fleas Household Spray Extra Guard 600ml contains an insect growth regulator for extra protection around your home. This spray kills fleas, larvae and other insects and also prevents hatching eggs developing into fleas. It protects carpets, soft furnishings and pet bedding for up to several months. Contains an Insect Growth Regulator for extra protection. Kills fleas, larvae and other insects. Prevents hatching eggs developing into fleas and protects carpets, soft furnishings and pet bedding for up to six months. Not for use on animals. 600ml can is sufficient to treat an average sized home. Protects for up to 6 months.