A triple action home flea formula that kills adult fleas around the home for up to 3 months, plus stops fleas eggs and larvae developing for up to 12 months. It also kills house dust mites which can be a common cause of allergies in people and pets. Breaks the flea lifecycle. Kills fleas for up to 3 months. Stops flea egg development for up to 12 months. Kills house dust mites.