Feliway Optimum starter kit combines a diffuser and refill featuring a patented, next-generation Feline Pheromone Complex. This advanced formula delivers 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. Designed for home use, this calming aid offers improved efficacy to support a more peaceful multi-cat or single-cat household.