FELIWAY Classic, developed by the #1 vet recommended brand, mimics natural feline facial pheromones to help reduce common signs of stress in cats. Helps with: scratching, urine spraying, hiding, and other fear related behaviors related to changes in your cat's environment like changes in the home. FELIWAY Classic is drug-free and non-sedating. 9/10 cats showed improvement in urine spraying & 8/10 cats reduced scratching when using FELIWAY Classic. FELIWAY is supported by over 25 years of feline stress expertise.The diffuser continuously releases a calming pheromone analog for up to 30 days, to help comfort your cat. Simply plug into an open outlet with 4+ feet of space to diffuse, with vents pointed upright. Safe to use - while pheromone analogs may help your cat, they won't affect humans or other pets. Starter kit includes 1 diffuser head and 1 vial; make sure to only use a FELIWAY Diffuser with a FELIWAY Classic Refill (they are not compatible with other brands).