Comfort Zone Cat Calming Collar. Helps cats feel safe, happy, and calm. Provides calming pheromones for cats on the go, indoors or out. This drug-free solution helps your cats feel safe, happy, and relaxed while encouraging positive behaviors. It calms stressed cats and keeps them comfortable during stressful situations such as moving home, loud noises, travelling, and changes in their environment. The Comfort Zone Calming Pheromone Collar should be worn 24/7, indoors or outdoors, and replaced every 30 days. Cat calming pheromones are released by the collar as your cat wears it. These pheromones mimic your cat's natural calming pheromones that signal the area is familiar and safe.