Transforms fragrance infused with natural essential oils into a mist (Air Wick Essential Mist contains natural Essential oils that are automatically transformed into a fine mist). Fills the room. New. Starter Kit. 1 refill lasts up to 45 days (Based on lowest intensity setting). Adjustable. Cardless. Only approved for use with Air Wick Essential Mist refills. Please see inside panel for further instructions and more information.