This is the 48ml refill vial for the diffuser Feliway Diffuser. The diffuser unit is sold separately. If your cat is showing signs of stress, Feliway may be able to help. The Feliway Cat Diffuser discretely releases a synthetic version of cat pheromones – odourless to humans and other animals – that mimics the natural pheromones of your cat and helps to promote a sense of calm. It might sound a little far-fetched, but the findings are scientifically based – and remember, Jumbo Pets only stocks APVMA-registered products. Product details Refill for the plug in diffuser releases synthetic cat pheromones to enhance feelings of familiarity and security in fearful or stressed cats assists cats in challenging situations such as moving house or renovating.