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 Waters; Physical Form: Liquid; Application: Automatic Odor Control; Volume Capacity: 0.67 oz.