Razer is never afraid to place their logo prominently on their products.
Here is the Razer Fidelity processor, which powers the AC-1.
This is the Razer HD-DAI. The HP-1 headset plugs directly into this connector. If you will notice, the connector is not centered in the PCI bracket. More on that later.
This adapter plugs into the HD-DAI and provides somewhere to plug in regular headphones, amplified stereo speakers, 2.1 system, 5.1 system, or 7.1 system and your mic.
The AC-1 has S/PDIF in and out. Since many people don't use them, Razer thoughtfully covered them to keep dust out.
Included is a quickstart guide, more detailed instruction book and the installation/driver CD.
Installation of the AC-1 is very straightforward.
Uninstall or disable your present audio drivers in the Hardware Manager. Personally, I would uninstall if a separate sound card, and/or disable the onboard sound.
Turn off your computer and unplug the AC power cord. Open the case.
Remove the mounting screw on an open PCI slot. (or open the tool less clamp)
Place the bracket tab into the opening beside the motherboard and seat the card's firmly into the PCI connector on the motherboard. Replace the screw (or close the clamp) and close the case.
Plug in your computer, and turn it on. Place the installation/driver CD in your optical drive and follow the instructions. And, that's it.