Product parameters:1. Full-duplex 5.1-channel PCI-e Express sound card2. Use VIA VT1723 Envy24D multi-channel sound chip3. Comply with PCI-e Express x1 specification revision 1.14. Comply with 66 Channel AC'97 specification revision 2.35. Sound sampling rate 24-bit, 48 KHz supports playback and recording6. Support front L/R, surround L/R, Centre/Subwoofer, S/PDIF-Out7. Optional daughter card supports rear surround L/R, linear input L/R, mono Mic-In, S/PDIF-In8. When the PC power is off or on, the noise balance cancellation function