Feature: 1. Equipped with CMI/HT8738 chip, delivering a signal-to-noise ratio of 120dB. The PCI interface supports full-duplex playback and recording with 3D spatial audio positioning, and is compatible with 3D Direct Sound and A3D interface. 2. Compatible with Windows 98, Windows 2000, XP, and NT operating systems. 3. Supports 4-channel surround sound output, DLS sound bank technology, A3D 1.0, DS3D, DirectSound 3D, and EAX audio effects. Also supports 24-bit SPDIF output and simultaneous optical input/output via daughter card. 4. Compatible with MIDI synthesizers and standard sound cards; supports full-duplex recording and playback. 5. Features a digital audio indicator for music SPDIF, 24-bit stereo recording and playback at 44KHz, high-fidelity audio quality up to 120dB, and dual playback and recording capabilities. Specification: Item Type: PCI Sound Card Signal to Noise Ratio: 120dB Supported Operating Systems: Windows 98, Windows 2000, XP, NT Package List: 1 x Sound Card 1 x Driver CD