Beaphar CatComfort is a simple and effective solution to reducing problem behaviour in cats, such as inappropriate scratching and urination, or general feelings of anxiety, this easy to use refill is only suitable for use with Beaphar CatComfort Calming Diffuser It contains a copy of the naturally produced cat facial pheromone, which gives a continuous and reassuring message to let cats know that this a safe area for them to be in Each refill is effective for up to 30 days, refill and use the diffuser in the room your cat spends most of their time and use continuously, do not switch off when leaving the house Do not use near open windows/doors or drafts as this will reduce how well the diffuser works and its very effective in an area up to 70m² Store in a cool, well ventilated safe place, until ready to use and store the refill from places protected from sunlight