Comfort Zone MultiCat Diffuser Refill is a quick and easy refill for your Comfort Zone MultiCat Diffuser when it runs out. Simply unscrew your old diffuser bottle and replace it with the new one. The Comfort Zone MultiCat Diffuser is specifically designed for cats that arenrsquo;t getting along. Fighting, scratching, urinating all of these behaviors can be caused when two or more cats get territorial while living under the same roof. Using pheromone technology, this multicat diffuser helps calm this destructive behavior so your cats can get along peacefully. One diffuser covers a room for 30 days, so place one in the rooms where your cats frequent the most or in every room of the house for total coverage. Due to its effectiveness and easeofuse, a diffuser is an excellent choice for reducing feline behavior issues. For tension and conflict between multiple cats within a home Calming pheromone technology Refills the Comfort Zone MultiCat Diffuser Each diffuser covers one room and lasts 30 days.