Sentry Behavior Calming Pheromone Portable Calming Diffuser for Cats are an in-home pheromone diffuser kit designed to help cats feel more relaxed and reduce stress-related behaviors. It continuously releases an odorless vapor that mimics natural calming pheromones, creating a comforting environment that can alleviate behaviors like urine marking, scratching, hiding, and excessive meowing. This drug-free solution is ideal for easing cats during stressful situations (such as moving, new pets, or loud noises) and each diffuser covers a room to promote a sense of security and well-being in your cat. Sold as 1 Unit with a 2-Pack Refill Pack Cartridge Option