Contains natural essential oils. No water needed as oil diffuses into a mist through microscopic holes in the vibrating plate. Each refill lasts up to 45 days on the lowest intensity setting. For use in Air Wick® Essential Mist Diffusers. Three intensity settings for ultimate fragrance control. Scent: Fresh Water Breeze; Physical Form: Liquid; Application: Automatic Odor Control; Capacity (Volume): 0.67 oz.