This is a Creative Sound Blaster SB1500 SBX Pro Studio PCIe x1 5.1 3.5mm OpticalIt is an internal sound card plug-in card designed for high-quality audio experience in computers.It has 5.1 channels, 3.5mm output and optical S/PDIF input and output and us compatible with PCI Express x1 ports.Please be sure to check that it is compatible with your build before purchasing. This was pulled out of a custom build that one of my customers (I own a moving company) no longer wanted. I am just parting it out.