The Pet Remedy Calming Plug-In Diffuser provides a natural way of tackling anxiety and stress in all pets & animals. Several years of research & trials have resulted in a unique formula using low concentration Valerian essential oil, blended with Vetiver, sweet basil & sage. Simply plug in and let the de-stressing properties slow release into the surrounding area. It starts to help immediately, calming the pet without sedation. The Plug-In lasts up to 8 weeks and covers an area approximately 650 square feet. One refill is included, additional refills may be purchased separately.