FELIWAY Optimum Diffuser Starter Kit For Cats FELIWAY Optimum is the leading behavioural product for cats, with over 11 million cats benefiting from it. It contains a new feline pheromone complex that conveys impactful messages to your cat, helping them cope with modern lifestyles and reducing signs of stress like scratching, urine spraying, tensions, conflicts, and anxieties due to environmental changes or fears. The home diffuser is designed to be plugged in and left on continuously, with each refill lasting up to 30 days. FELIWAY Optimum has a 9.1/10 cat owner satisfaction rating and is suitable for any cat or kitten.