1. Full-duplex 5.1-channel PCI-Express sound card 2. Adopt VIA VT1723 Envy24D multi-channel sound effect chip 3. Comply with PCI-Express x1 specification revision 1.1 4. Comply with AC'97 standard revision 2.3 5. Sound sampling rate 24-bit, 48 KHz supports playback and recording 6. Support front L/R, surround L/R, Centre/Subwoofer, S/PDIF-Out 7. Optional daughter card supports rear surround L/R, linear input L/R, mono Mic-In, S/PDIF-In 8. When the PC power is off or on, the noise balance cancellation function Product name: PCIe sound card Chip: CMI8738 Support channel: 5.1 channel Input and output interface: analog, linear input Installation : built-in : Support / 7/Vista/XP/Server 2003-2008 32/64-bit, 2000, ME, 98SE OS PC computer with PCI-Express slot Colour: black Material: PCB+metal Note: This product cannot be used in MSWin10windows10/11 64-bit system Package Content: 2 x PCIe sound card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Adopt CMI8738 5.1 multi-channel sound effect chip PCI-e sound card adopts PCI-Express bus slot, supports 6-channel surround sound output, supports DLS sound library technology, supports A3D 1.0 and DS3D, and is compatible with DirectSound 3D and EAX sound effects. Support 24-bit SPDIF OUT and SPDIF IN (optional), provide surround sound field and clear sound quality, suitable for home theater, large-scale 3D games, enjoy music, karaoke and other entertainment.