Dreamcast peripheral from 1998, with mode and sleep functions. - Model: Dreamcast Peripheral - Battery Type: CR2032 - Year of Manufacture: 1998 - Functions: Mode, Sleep function - Buttons: A, B buttons Thank you for viewing. Operation confirmed. The battery used for confirmation will also be included. It's reasonably clean, but please understand that it is an old item, so there may be some wear and tear on the exterior.