Feliway classic diffuser refill contains a synthetic copy of the cap cat appeasing pheromone which helps create a harmonious environment for cats at home it can help reduce aggression fighting hissing growling and less common behaviours such as hiding and fleeing r r features r r r r the diffuser is plugged in the room or area where the cats spend most of their time r r covers an area of 50 70 sq m r r use the product until the conflict subsides