Manufacturer: Japan HP Model Number: EliteDesk 800 G2 Mini Desktop PC CPU: Intel Core i7 6700T Memory: 4GB, 1 slot available Hard Disk: 500GB M.2 slot available x 1 Interfaces: USB ports x 6, Type C x 1 D-sub15 (analog), DisplayPort x 2, LAN port HDMI is not included, so you can buy a DisplayPort to HDMI adapter for around 500 yen on Amazon. I think most models of this type don't have HDMI. It has been initialized with Windows 11, so it's probably Windows 11. Accessing the inside is easy; just loosen the large screw on the back. No screwdriver is needed. You can easily find more information on YouTube. Accessories: AC adapter