Scientifically Proven: The Sentry Portable Calming Diffuser Refill for Cats is scientifically proven to help reduce stress-related issues, scratching, marking, or excessive meowing that your cat may experience when anxious Up to 30 Days of Calming Pheromones: For up to 30 days, the Sentry Portable Calming Diffuser passively releases pheromones to help reduce stress-related behavior in your cat at home and on the go No Electricity Needed: Provide your cat the support they need without electricity. The Sentry Portable Calming Diffuser requires no batteries or outlet to bring comfort and calm to your cat Helps Reduce Stress: The Sentry Portable Calming Diffuser Refill for Cats is scientifically proven to help reduce stress-related issues, scratching, marking, or excessive meowing that your cat may experience when anxious Covers up to 700 Square Feet: Your cat can get the support they need wherever they may be. The Sentry Portable Calming Diffuser passively releases pheromones for up to 30 days in areas of 700 square feet