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 / ME / 2000 / XP / 7 / OS 9.1 ( version has only 2 channels to play). Add full-duplex audio playback/recording on any PC or .In digital play mode, receive audio streaming PC via USB interface and transmit audio data according to / , IEC60958, S/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. Colour:Black Material:Metal Size:89x69x21mm Package Contents: 1 * 5.1 / 7.1 Surround Sound Card 1 * USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.