What it is: A cartridge designed to fit snugly into your electric diffuser or car diffuser. Fragrance story: Ambre is a warm and elegant procession of woods, vetiver and patchouli, enhanced with radiant aniseed, insolent spices, mysterious incense, cistus and tonka bean.How to use: Simply slide the cartridge into the machine and switch it on to diffuse the scent three times during a one-hour cycle. Repeat as often as you wish. Fragrance cartridge only; diffuser sold separately