The Feliway Multi-Cat Calming Diffuser Starter Kit is an easy-to-use solution to reduce conflict between cats living together. This cat calming diffuser may help decrease fighting, chasing, blocking and staring. The cat calming diffuser provides a synthetic copy of the feline pheromone from the mammary gland area after a mother gives birth to bond with kittens. By mimicking the cat's natural pheromones, the cat calming diffuser creates a state of calmness and comfort to alleviate tension and conflict between cats. As a result, this cat calming plug in can be used to help reduce tension and conflict in multi-cat households.