Check the listing for details. Cat Calming Diffuser 6 in 1 Multicat Pheromone Diffuser Pheromones to Calm. Color: Blue, Condition: New. Listed at 28.84 USD. Cat Calming Diffuser 6 in 1 Multicat Pheromone Diffuser Pheromones to Calm. Condition is New. Shipped with USPS Ground Advantage.