This mid-2011 iMac is model A1311 (iMac12,1). It has a 2.5 GHz Intel Core i5 "Sandy Bridge" processor, 4 GB of RAM (room for 4 GB more), a 500 GB Hard Drive and 8x SuperDrive DVD player/burner. Additional software includes Pages, Keynote, Numbers, iMovie, iDVD, iPhoto, etc. It is running Mac OS 10.11.6, but can go up to 10.13.x. But the OS software newer than what is on it doesn't run the iDVD making software as well, which is what I like to make with this Mac. Comes with Apple keyboard and Logitech mouse. Plus, these models have tons of connections including audio in and out, 4 USB, FireWire, and Thunderbolt 1. Oh, and it has a remote for running certain software like Music and DVD Player. It is in great working condition. I only accept cash only. Send a KSL Message with any questions or to come and see it.