A twin pack of Sage & Citrus refills for the Yankee Candle ScentPlug electric diffuser. Each 18.5 ml refill clips into a ScentPlug base (sold separately) that plugs into a wall socket and gently warms the oil to fill the room with fragrance, with no flame. Sage & Citrus blends earthy sage with lavender and lemon-lime. Top notes of Herbaceous notes, Lavender and Citrus lead into a heart of Geranium and Lavender, finishing with Patchouli, Powdery Notes, Musk and Woody Notes. Yankee Candle says each refill lasts four to six weeks, so the pack gives roughly two to three months of fragrance, and having the second refill on hand means you can swap straight over when the first runs out. Each refill measures about 7.6 x 7.9 cm.