Leave a lasting impression on guests and ensure a consistent experience with Air Wick Scented Oil Refills with Essential Oils. Keep supply rooms stocked with the pleasant scent your guests associate with your business or home. Enjoy up to 140 days of natural-smelling fragrance (on the lowest setting). To refill, simply unscrew the cap and insert the refill into the warmer (not included) until it clicks. Adjust the warmer settings to achieve the ideal fragrance level in each room. Enhance entrances, common areas, offices, breakrooms and guest rooms with an appealing scent.