Diffuse tension in your home. Keep your cat feeling right at home with the Feliway MultiCat 30 Day Diffuser Refill + MultiCat 30 Day Starter Kit Plug-In Diffuser & Refill bundle. When a cat has kittens, she releases natural, calming pheromones as her kittens start to nurse. This diffuser works by mimicking this bonding pheromone to create a state of calmness and comfort to alleviate tension and conflict between cats. As a result, Feliway can be used to help reduce conflict in multi-cat households, and as a source of calming energy for cats facing a change in environment.