Sega Saturn Power Memory. I haven't confirmed its operation because I don't have the main unit. I purchased and used this item about 30 years ago. Please understand that there may be minor scratches, dents, and dirt due to aging, as well as oversights from my amateur inspection, but please forgive these imperfections due to the nature of the product. Please understand that this item has been in someone else's possession, and those who are sensitive to such things or seek a perfect product should refrain from purchasing.