The 2 boxes of 3  Feliway Optimum Happy Cats Calming Pheromone Refill provides 90 days of stress relief for your feline companions. Made by the trusted brand Feliway, this refill model 105B comes in a convenient unit quantity of 6. With a long expiration date of 2027, this product is perfect for cat owners looking to create a calming environment for their pets. Keep your cats happy and content with this effective pheromone spray refill.