The StarTech 4 Port PCI Sound Card Diamond DT-088 is a vintage sound card designed for retro PCs running on Windows 98 or XP. This plug-in card features 3.5mm output and input audio ports, making it compatible with PCI ports for enhanced audio capabilities. With its compact form factor and reliable brand like StarTech, this sound card offers a nostalgic yet functional solution for older computer systems seeking improved sound functionality. Very clean and never installed