Feliway Cat Optimum 30-Day Diffuser Starter Kit 48mLFeliway Optimum contains the patented latest generation of Feline Pheromone Complex, developed by the Feliway research team. This new discovery delivers advanced calming messages, helping your cats feel comfortable and secure at home. Feliway Optimum helps cats with the management of more signs of stress (such as urine spraying, vertical scratching, excessive hiding, and inter cat conflicts), in more situations, and calms cats better than ever. Best