This is the Epson Document Scanner DS-531. It's a high-speed A4 sheet-feed scanner that can scan both sides simultaneously. It scans up to 30 pages per minute (A4 single-sided), allowing for efficient digitization of large volumes of documents. Operation has been confirmed, and it has been verified to be working properly. Please note that this is a used item, so there may be some signs of use and minor scratches.