1 FELIWAY Optimum REFILL: The FELIWAY Optimum refill pack contains 1 x 48ml refill, compatible with a FELIWAY Optimum diffuser. REDUCES SIGNS OF CAT STRESS: FELIWAY Optimum offers up to 30 days of continuous calming benefits, helping resolve typical stress-related behaviours in cats, including urine spraying, scratching, fears, tension, and conflict. Each diffuser covers large living spaes (up to 70m²). FELIWAY EXPERTISE: With 25+ years of expertise, FELIWAY is trusted by cat parents, achieving a satisfaction rating of 9.1/10 and approved by 14 million cats worldwide. VET RECOMMENDED AND EASY TO USE: Clinically proven and simple to set up, FELIWAY Optimum is trusted by vets to improve your cat’s well-being with an easy, hassle-free application, backed by decades of expertise. FELIWAY SAFETY: FELIWAY pheromone products use cats natural messaging system. Drug-free and non-sedative, all FELIWAY products are safe for people and other animals in the household. THE MOST ADVANCED CAT CALMING SOLUTION: Featuring our latest generation pheromone, FELIWAY Optimum soothes cats better than ever by addressing more stress-related signs in more circumstances. Enhanced serenity was observed by 93% of cat lovers.