The Mac mini Core 2 Duo featured a 1.83 GHz Intel Core 2 Duo processor, 1 GB of SDRAM memory, an 80 GB Serial ATA hard drive, a slot-loading 8X DVD/CD-RW Combo drive, and it came with an Apple Remote.
Ports included DVI (with a DVI-to-VGA adapter included), Firewire 400, four USB 2.0 ports, a combined optical digital audio input/audio line in, combined optical digital audio output/headphone, a 10/100/1000Base-T Gigabit Ethernet port, and built-in AirPort Extreme/Bluetooth 2.0. It lacks an internal 56k modem.
This model had the same case as the original Mac mini: 6.5 inches square, 2 inches tall, and weighed 2.9 pounds. This and all Mac mini systems ship without a display, keyboard, or mouse.
I upgraded to this Mac mini from the original due to its larger hard drive and optical digital audio output/headphone jack. I used it for the same purpose as the original to access iTunes and digital movies. It also permanently replaced my DVD player in the age of physical-DVD Netflix (before digital streaming, Netflix movies arrived in the mail on DVDs that played in a DVD player).
Now that this Mac mini has been retired as my media server, I use it to power my digital fireplace.