Veterinarian Recommended: Comfort Zone diffusers and refills are a veterinarian recommended solution to keeping cats safe, happy and calm., Drug-free solution that helps to calm your cat, reduce destructive behaviors and helps your cat feel more comfortable in their environment, Use to help reduce multiple cat household tension, fighting, and stress to help cats live in harmony, Helps reduce urine spraying and destructive scratching in the home, Our diffuser plugs into the wall blanketing one entire room, and lasts 30 days, Creates a calming, safe, relaxing environment for your cats and will not affect other household pets, Suitable for all life stages, Refills compatible with Comfort Zone Diffusers, Safe and certified to UL standard, shut-off feature prevents over-heating, 90 DAYS OF CALM: Place the diffuser in your cats' favorite room and replace the refill every 30 days for continuous calming benefits