This 5.1 surround USB 2.0 external sound card audio adapter is perfect to connect headphones or speakers your computer. The sound card is a highly flexible audio interface which can be used either with Desktop or Notebook systems. The adapter turns your stereo speaker or earphones into 5.1 channel environment and it supports 7.1 channel. This adapter is perfect for you to enjoy the high quality sound. - Plug and play under windows without external memory - Supports AES/EBU IEC60958 S/PDIF consumer formats for stereo PCM audio - 5.1 channel DAC output with 16 bit resolution - Supports virtual 7.1 channel - Supports digital recording function with 32 KBz 44.1KHz and 48 KHz sampling rate - Supports analog recording function - Supports SCMS (Serial copy Management System) copy protection -Compatible with window 98SE ME 2000 XP MAC OS 9.1 VISTA (MAC version has 2 channel playback only) - Fully duplex playback / recording audio stream without sound card in PC. - Compliant with USB specification V1.1 V2.0 - Compliant with USB audio device class V1.0 V2.0 - Supports USB full speed 12 Mbit 480Mbit serial data transmission - 3 input terminals - 3 output terminals - Supports input and output channels - Supports multi channels audio code interface for 7.1 channel playback - Supports conventional audio 2 channels source playback (only Left Right channel active)