This is a genuine AC adapter that can be used with the DUO-RX and DUO-R. It has been tested and confirmed to work with an actual DUO-RX unit. There are damages such as scratches and stains. Please check the condition by viewing the photos. *If it's difficult to confirm the condition with the photos provided, please comment before purchasing. I will add more photos as needed. Immediate purchase without comments is OK. Thank you. *I am also selling PC Engine software. If you purchase multiple items, a discount is possible (about the amount of savings on shipping with combined shipping). Discounts are not available for single item purchases.* Also, if you want combined shipping, please consult before purchasing. I cannot accommodate combined shipping after the item has been purchased. *Shipping will be via Yu-Packet Plus. Combined shipping may not be possible due to the size of the package.* *Yu-Packet Plus does not allow for specifying a delivery date or time.* *Although operation has been confirmed, this is a very old product, and I cannot guarantee its operation after purchase. Also, I cannot accept returns, refunds, or cancellations of the transaction. Please purchase only if you understand and accept this.*