Easy tiger, its time to put an end to unwanted spraying and scratching. ThunderEase helps your cat feel calm and comfortable by mimicking natural facial pheromones that felines use to mark their space. Tested to be over 90% effective for reducing anxiety symptoms, your cat will feel safer and less-stressed, totally drug-free. Diffuser not included. Single-room use. One refill included. Replace refills every 30 days for maximum calming benefits.