Feature: 1. With CMI/HT8738 chip, the signal-to-noise ratio reaches 120dB. The PCI interface supports full-duplex playback and recording with 3D spatial positioning audio effects, and is compatible with 3D Direct Sound and A3D interface. 2. This sound card is compatible with Windows 98 / Windows 2000 / XP / NT, supporting signal voltage from 0.5V to 5V. 3. Supports 4-channel surround sound output, DLS sound library technology, A3D 1.0 and DS3D, DirectSound 3D and EAX audio effects. Also supports 24-bit SPDIF out and SPDIF in simultaneously, with optical input and output via daughter card. 4. Compatible with music synthesizers and traditional sound cards, supports full-duplex recording and playback. 5. Features a music-SPDIF digital audio indicator, 24-bit stereo 44KHz audio recording and playback, 120dB sound quality, and dual playback recording capability. Specification: Item Type: PCI Sound Card Signal to Noise Ratio: 120dB Support: Windows 98 / Windows 2000 / XP / NT, signal voltage (0.5V~5V) Package List: 1 x Sound Card 1 x CD