All Mac Mini's have been tested to be in great working condition but will show minor signs of use, which may include scratches and dents, all of which do not affect the usability of the product. All ports are fully functional.
Specs:
MC815LL/A:
Processor: 32-nm "Sandy Bridge" 2.3 GHz Intel "Core i5" (2415M) processor
RAM: 2GB / 4GB / 8GB
Storage: 250GB / 500GB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC. It is not compatible with macOS Mojave (10.14) or later versions of the operating system.
Year Released: Mid-2011
Model Number: A1347
MC816LL/A:
Processor: 32-nm "Sandy Bridge" 2.5 GHz Intel "Core i5" (2520M) processor
RAM: 4GB
Storage: 500GB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC. It is not compatible with macOS Mojave (10.14) or later versions of the operating system.
Year Released: Mid-2011
Model Number: A1347
MC936LL/A:
Processor: 32-nm "Sandy Bridge" Quad Core 2.0 GHz Intel "Core i7" (2635QM) processor
RAM: 4GB / 8GB
Storage: 500GB / 1 TB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC. It is not compatible with macOS Mojave (10.14) or later versions of the operating system.
Year Released: Mid-2011
Model Number: A1347
MD387LL/A
Processor: 22-nm "Ivy Bridge" 2.5 GHz Intel "Core i5" (3210M) processor
RAM: 4GB / 6GB/ 8GB
Storage: 500GB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC.
Year Released: Late 2012
Model Number: A1347
MD388LL/A:
Processor: 22-nm Quad Core "Ivy Bridge" 2.3 GHz Intel "Core i7" (3615QM) processor
RAM: 4GB
Storage: 1 TB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC
Year Released: Late 2012
Model Number: A1347
MD389LL/A:
Processor: 22-nm Quad Core "Ivy Bridge" 2.3 GHz Intel "Core i7" (3615QM) processor
RAM: 4GB
Storage: 1 TB
Operating System: This model is capable of running macOS High Sierra (10.13), and it supports HEVC (High-Efficiency Video Coding), but it does not support hardware accelerated HEVC
Year Released: Late 2012
Model Number: A1347
MGEM2LL/A*:
Processor: 22 nm "Haswell" 1.4 GHz Intel "Core i5" (4260U) processor
RAM: 4GB / 8GB/ 16GB
Storage: 500GB
Operating System: This model is compatible with the final version of macOS Mojave (10.14) and the current version of macOS Catalina (10.15), as well.
Year Released: Late 2014
Model Number A1347
MGEN2LL/A*:
Processor: 22 nm "Haswell" 2.6 GHz Intel "Core i5" (4278U) processor
RAM: 8GB
Storage: 1 TB
Operating System: This model is compatible with the final version of macOS Mojave (10.14) and the current version of macOS Catalina (10.15), as well.
Year Released: Late 2014
Model Number: A1347
MGEQ2LL/A*:
Processor: 22 nm "Haswell" 2.8 GHz Intel "Core i5" (4308U) processor
RAM: 8GB
Storage: 1 TB
Operating System: This model is compatible with the final version of macOS Mojave (10.14) and the current version of macOS Catalina (10.15), as well.
Year Released: Late 2014
Model Number: A1347
*Mac Mini's released in 2014 come equipped with an extra Thunderbolt Port which allows for high-speed connection in hard drives, RAID arrays, video-capture solutions, and network interfaces, as well as transmit high-definition video using the Display Port protocol.
Refurbished products are devices that have been restored to full functionality. The upside from a "refurbished" and "used" device is that refurbished devices have been tested and certified to function properly, and hence being free of defects, while "used" products may or may not have restrictions in function.