Feliway is a manmade version of the odourless pheromone normally left by cats when they rub against objects in their environment. This pheromone is usually released by your cat when he or she feels happy or content and is also used to mark territory. When used correctly feliway can help to reduce your cats stress levels and combat marking behaviours like scratching or urine spraying. The diffuser is designed to be left on continuously and will cover a space of 50-70m2. Avoid placing the diffuser behind furniture, doors or curtains or underneath shelves as this can make it less effective. Each diffuser refill will last for 30 days. Ingredients: F3 fraction of feline facial pheromone analogue 2%.