Feliway Optimum refill features a patented, latest-generation Feline Pheromone Complex developed by the Feliway research team. This cat pheromone diffuser refill delivers advanced calming messages that help cats feel comfortable and secure at home. It helps in the management of more signs of stress, including urine spraying, vertical scratching, excessive hiding, and intercat conflicts. Choose this cat calming diffuser refill to support a more harmonious home and improved indoor cat behavior.