Mac OS High Sierra
2.5 Ghz i5 processor, 12GB RAM, 500 GB hard drive, 512mb video.
Includes compact aluminum wireless keyboard and mouse.
Connectivity = four USB 2.0 ports, a firewire "800" port, built-in AirPort Extreme, Gigabit Ethernet, an SDXC card slot as well as a single "Thunderbolt" port.