Features: This sound card uses CMI/HT8738 chip. The chip's signaltonoise ratio reaches 120dB, PCI plugandplay interfacefull duplex playback and recordingHRTF 3D spatial positioning sound effects, supports dircet sound 3D and A3D interfaces. Support for Windows 98 / for Windows 2000 / XP / NT signal voltage (0.5V~5V). Support 4 channel surround sound output, support DLS sound library technology, support A3D 1.0 and DS3D, compatible with DirectSound 3D and EAX sound effects. Supports 24bit SPDIF, OUT and SPDIF IN at the same time, and supports optical fiber input and output. This card supports music synthesizer, traditional sound card, and supportsfull duplex playback and recording. Support Direct Music SPDIF digital audio indicators: 24bit stereo, 44KHzsound sampling recording and playback, 120dB sound quality full duplex playback recording. Specification: Item Type: Sound card SignaltoNoise Ratio: 120dB Support: For Windows 98 / for Windows2000 / XP / NT signal voltage (0.5V~5V) Package List: 1 x Sound Card 1 x Optical Disc