Sample Rate: 48 / 44.1 KHz for Recording and Playback External Box: Yes Line In: Yes SPDIF In: Yes Operating Systems Supported: Windows 7 / XP / 2000 / Server 2003; Windows Vista System Requirements: One available USB port Minimum Intel Pentium II 350 MHz or equivalent PC with 128MB RAM Amplified computer speakers or headphone DirectX 8.1 or above CD-ROM drive Features: USB specification 2.0 compliant USB audio device class spec. 1.0 and USB HID class spec. 1.1 compliant Full-duplex recording and play-back 7.1 channel connector S/PDIF optical digital input and output 3.5mm jack connectors Support 48/44.1 KHz sampling rate for both playback and recording Dolby digital audio streaming via S/PDIF out Dual microphone support