Apple "Late 2012" iMac: 27" display, model A1419 (EMC 2546) quad-core 2.9Ghz processor, 8Gb memory, 1GB hard drive, ethernet, thunderbolt, bluetooth, wireless ("Airport"), USB3, and more... in brand new condition with no scratches or damage and compatible with current and previous OS versions - currently running macOS High Sierra (latest). Includes wireless Bluetooth Apple keyboard and mouse.
More info on this model can be found here:
https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-27-inch-aluminum-late-2012-specs.html