This diffuser has some staining around the bottom (see pictures); however, it has been cleaned and its functionality is not affected. This diffuser was manufactured in August 2021 and its serial number is JX21302737. From Pura’s website: The Pura Smart Fragrance Diffuser empowers you to personalize every detail of your home fragrance experience —all from your phone. Simply plug in, program, and let premium, clean fragrance enhance your every mood.