An innovative (and incredibly potent) liquidless diffuser. This set features two scents, one evoking the Mediterranean sea and the other, Japan in spring. The Scent Scene Duo includes two individually packaged Scent Stems fragrances: Night Before Christmas Dancing Sugar Plums & Midnight In Milan Saffron & Rose. To use place your Scent Stems of choice into the metal vessel, ensuring it's placed on a flat surface away from open windows or vents. After 30 days, or a time of your choosing, swap out the Scent Stems for the other supplied fragrance. Replacement Scent Stems are sold separately, with seven fragrances to choose from. We suggest replacing your Scent Stems every 30 days to refresh your fragrance or to increase their strength. After 30 days the Scent Stems can be placed in recycling with other paper products