What it is: A fragrance diffuser insert of the fresh floral Roses scent-compatible with Diptyque home, wall and car diffuser systems.Fragrance story: This scent is like a tender, freshly picked bouquet, it pays ravishing homage to the queen of flowers. Blooming in the heart of winter-some are still budding, others are blooming, their petals still beaded with dew. Their scent saturates the air with fresh, flowery notes. The cartridges contain pearls highly concentrated in perfume, faithfully reproducing each note of the fragrance. How to use: The cartridges can be kept for up to 3 months after opening, provided the container is properly closed after use.They have a lifespan of 40 hours continuously or up to 80 diffusion cycles (1 cycle corresponding to 1 hour). Fragrance cartridge only; diffuser sold separately