2 Electric Refill Oils * Twin Box * For use with all Yankee electric frangrance unit air fresheners * The woody scents of mistletoe, berries, pine boughs, and holly create this holiday tradition. A convenient way to make sure you always have a reserve on hand so you never run out. Plus, they make it easy to enjoy your favorite authentic, true-to-life Yankee® scent in multiple locations. Replace after 4 to 6 weeks. Contains two bottles of scented oil which are designed to fit both Yankee Candle® Electric and Electric 2 home fragrance units.