Twin packs are 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 favourite authentic, true-to-life Yankee® scent in multiple locations. Refills last for 4 – 6 weeks. Lemon Lavender is a clean and inviting fragrance … a powdery fresh blend of tangy lemon citrus and sweet lavender flowers.  Use only with Yankee Candle® electric home fragrance ScentPlugs (sold seperately).