FELIWAY CLASSIC Diffuser Starter Kit is a clinically proven pheromone solution to help comfort and reassure your cat at home. It works continuously to help cats and kittens adjust to changes in their environment, feel comfortable in a new home and avoid unwanted behaviours like urine spraying, scratching and hiding. Trusted by veterinarians and pet owners worldwide for over 20 years, more than 14 million cats have benefitted from FELIWAY cat pheromone products.