This Brother MFC-9840CDW Laser Printer Scan Unit (10101390XXXA) is a great addition to your office equipment. It is compatible with Brother printers of the MFC series, including the MFC-9840CDW model. This unit allows for scanning of documents and images at a high quality, making it perfect for businesses needing to digitize paperwork. The scan unit has been previously used but is still in good working condition, ready for your use.