Is your cat peeing outside the litter box, scratching 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 unwanted behaviors cat owners deal with. FELIWAY CLASSIC provides !ppy messages"y mimicking the natural feline reassuring messages (pheromones) to make cats feel calm. This product has been found to reduce scratching, spraying, and hiding for 90% of cats - many owners see results within 7 days. Cats are also very sensitive to change, so if you anticipate changes in the home (moving, renovation, recorating, new pets, etc), FELIWAY is effective in helping cats remain calm, and adapt to changes without unwanted behaviors. The FELIWAY Classic Diffuser Refill includes one refill vial (diffuser sold separately). You should 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 furniture. Each refill can last up to 30 days. For maximum effectiveness, you should replace your diffuser every 6 months. Make sure to follow instructions when plugging in your diffuser, and plug diffuser in upright.