FELIWAY(R) Diffuser Plug-In Starter Kit for Multiple Cats FELIWAY MultiCat works to relieve tension and conflict between cats. The pheromone in FELIWAY MultiCat mimics the cat appeasing pheromone, which encourages social bonding and comforts and calms cats. FELIWAY MultiCat helps your cats live under one roof by providing them with a calming effect during social interactions. It is clinically proven to reduce conflict between household cats. After using FELIWAY MultiCat, 84% of owners saw their cats getting along significantly better. Owners saw results in as little as seven days and a significant reduction in conflict within 21 days. The starter kit lasts up to 30 days and covers up 700 sq. ft. Use the diffuser for at least 30 days. FELIWAY MultiCat is not a drug. It is non-sedating, non-systemic, and has no known contraindications with any other treatment. The diffuser works by using a heating element to disperse the pheromone into the air. Once the pheromone is present, the pet breathes it in, and the pheromone attaches to a receptive organ called the vomeronasal organ located in the nasal cavity. The vomeronasal organ then signals the brain, via nerves, and a sense of well-being is established. Features: Ideal for cat conflicts and introducing new cats into the home Starter Kit includes Diffuser Plug-in and Refill (48ml) Diffuser covers a room up to 700 square feet Refills sold separately Please Note: One diffuser will cover up to 700 sq. ft. in an open floor plan. The diffuser will not diffuse the pheromone outside of any given room though. Given the size, floor plan, and where the cat spends the most time, you should consider getting more than one diffuser.