FELIWAY Optimum Diffuser & Refill Starter Kit (48 mL refill). This is a synthetic cat pheromone diffusion system designed to reduce visible signs of stress, support calmer behavior, and improve harmony among multiple cats. It is drug-free and odorless for humans, suitable for all cats (from kittens to elderly cats). One refill provides continuous diffusion for up to 30 days with coverage of up to ~70 m² per diffuser.

Manufacturer: Ceva Santé Animale.