Clean machine with 64 bit Windows 10 Pro.  I was prompted to enter the product key when I connected to the internet.  An instruction sheet is provided to assist with getting it right on the first try.  TekRefurbs did a great job of packaging the machine for shipment.  This machine comes with a power supply "brick" like a large laptop computer would use.  It does not plug directly into an AC outlet.  The DVD optical drive is also the style you would find in a laptop computer.  The included keyboard and mouse are flimsy, but I think most of us are upgrading hardware and will have a better mouse and keyboard available to use anyway.  I purchased a Moread display port to DVI adapter so I could use my old monitor.  That conversion was plug and play and works great.  Fastest boot time from a cold start I've seen on a Windows machine in a long time.  Love the SSD - silent and fast.