Is your cat peeing outside the litter box, scratching your furniture, or hiding on a regular basis? These behaviors may be caused by fear and anxiety. FELIWAY products are vet recommended, drug free, and shown to help alleviate many of these unwanted cat behaviors. FELIWAY CLASSIC provides “happy messages” by mimicking the natural feline reassuring messages (pheromones) to make cats feel calm and comfortable at home. This product has been found to reduce scratching, spraying, and hiding for 90% of cats - many owners see results within 7 days. Cats can be sensitive to change, so if you anticipate changes in the home (moving, renovation, new pets, etc.), FELIWAY is effective in helping your cats remain calm, and adapt to the changes without unwanted behaviors. This FELIWAY Classic Diffuser Refill kit includes three refill vials (diffuser sold separately). Plug your diffuser in the room(s) where your cat spends most time - each diffuser covers up to 700 sq. feet. Make sure your diffuser isn't covered by curtains or behind furniture. Each refill can last up to 30 days. For maximum effectiveness, you should replace diffuser every 6 months. Follow the instructions when plugging in diffuser, and plug it in upright.