Comfort Zone Two Room Multi-Cat Diffuser Kit For Cats and KittensAre your cats fighting, hissing or showing signs of tension and conflict These behaviors can be signs that your cats are stressed or anxious. Cats are very territorial and adding another cat into a multi cat home can cause the cats to feel threatened and stressed. Comfort Zone Multi Cat Diffusers dispense a drug free vapor that mimics a cats natural calming pheromones to create a calming environment which helps reduce your cats' tension and conflict.