Bought it from seller "recertified" (refurbchoice). Neatly and securely packaged.  The package also included a BT/WIFI adapter and a cheap keyboard and mouse if you need them.  Windows 10 Pro preinstalled and activated. Clean unit. This model supports 3 monitors but only if you have two of the monitors daisy-chained and connected to one DP. It can play youtube 4K @ 24 fps or 30 fps. With 60 fps, it stutters no matter what browser you use. It can accommodate two extra hard drives (or ssds) but one has to use the SATA and power cords of the optical drive as there are only 3 sets. You can take out the optical drive out but there is no point to do that. The unit has its own speaker but no card reader.