Features: brand new and high quality In analog playback mode, supports 6 channels of analog playback software. In the digital recording mode, it receives SPDIF digital audio input and sends it back to the PC via USB. Laptop OS support for: Win98SE or ME or 2000 or XP or 7 or OS 9.1 ( version has only 2 channels to for play). Add full-duplex audio playback or recording on any PC or .In digital for play mode, receive audio streaming PC via USB interface and transmit audio data according to for AES EBU, IEC60958, S or PDIF interface standards. Supports 32kbz, 44kHz. (Both of which need controller or software application support) and 48 kHz sampling frequency in digital recording, 48 kHz sampling in digital analog audio playback. Specifications: Material: metal Size: approx. 89x69x21mm or 3.50x2.72x0.83in Color: blue Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 1 x 5.1 or 7.1 Surround Sound Card 1 x USB Cable