This is an adapter that allows you to use various USB controllers on the Dreamcast console. It is a handmade product. For more details, please search for "Dreamcast USB4MAPLE". As shown in the image, connecting an SD card via a USB hub allows you to use the SD card as a memory card. I have tested the following controllers: * Xbox 360 wired controller * 8bitdo M30 2.4g (Recognized as an arcade stick, 6 buttons function) * HORI Switch wired controller (LR triggers work) I have confirmed that saving works without any problems. I have multiple units in stock, so please let me know if you would like to purchase more than one. The price listed on this page is for one unit. One unit is 1700 yen. Thank you for viewing.