The Performance Memory Card for Sega Dreamcast Controller, model P-20-316W, is a white external attachment designed specifically for the Sega Dreamcast platform. Made by SEGA, this memory card is compatible with the Sega Dreamcast controller and provides 200 blocks of storage capacity. It allows players to store game data and expand the capabilities of their console. This product, manufactured in China, is a reliable and essential accessory for enhancing the gaming experience on the Sega Dreamcast console.