Features: This sound card uses a CMI8738 chip to support 4-channel surround sound output, DLSvoicelibrary technology, A3D1.0 and DS3D support, and is compatible withDirectSound 3D andEAX sound effects. Simultaneously supporting 24-bit SPDIF OUT and SPDIF IN chips with a signal-to-noise ratioof 120dB PCI bus - fullduplex playback and recording - HRTF 3D spatial positioning sound effect, supporting Dircet Sound 3D andA3D interfaces Wide rangeof operating platforms, supporting multiple platforms such as MSDOS, WINDOWS3X, 9X, WIN2000, LINUXetc. - MPU401 GAME/MIDI port and surround sound SB16 support - downloadable waveform synthesizer Supports Direct Music SPDDIF digital soundperformance indicators: 24bitstereo, 44KHz sound sampling recording and playback 120dB sound fullduplex playback recording Automatic detection of SPDIF/IN CRL3D sound technology 3Dinterface supporting MicrosoftD3D Supports two/four speakersandDLS, supports waveform table music synthesizer compatible withtraditional sound cards Fullduplex playback and recording support for Windows 98/Windows 2000/WinXP Specifications: Item: PCI5.1 StereoSurround Sound Card Mixing/Karaoke Signal Voltage: 0.5v~5v Chip:CMI8738 Support 4-channel surround sound output, Support DLSvoice library technology, A3D1.0 and DS3D Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC PCI5.1 StereoSurround Sound Card