This is the early 2009 model You can find full specs at http://www.everymac.com/systems/apple/mac_mini/stats/mac-mini-core-2-duo-2.0-early-2009-nvidia-specs.html .
The memory has been upgraded to 2GB (from 1GB) and hard drive has been upgraded to 500GB (from 120GB).
Purchased in May 2010, so you have around 8 months of Apple warranty remaining, and the option to buy extended AppleCare for an additional 2 years coverage.
Includes mini, power adapter and install disks (Snow Leopard).
This is listed elsewhere for $540. Mention you saw it on Mugoo and you can have it for $500. PM, or phone Gord at 613-831-1441
SOLD!