Feature: 1. SUPPORTED CHANNELS: The USB sound adapter supports 5.1 and 7.1 channels. It can be connected to 5.1 speakers to enhance the sound quality of your PC. 2. SUPPORT DIGITAL RECORDING: 7.1 USB sound card up to 48KHz sampling rate, support 32KHz/44KHz/48KHz digital recording function. 3. RICH INTERFACES: Sound card with SPDIF OUT, SPDIF IN, CEN/BASSOUT, REAR OUT, FRONT OUT, LINE IN, MIC IN interfaces. Feature rich to meet various needs. 4. EASY TO INSTALL: USB external sound card is easy to install, compatible for Win98/ME/2000, for WIN 7, for WIN 8, for WIN 10, for OS X 9.1 (for OS X only 2 channels can be used) and other systems. 5. APPLICATIONS: Upgrade existing integrated sound on desktop or laptop computers by supporting analog and digital sound outputs for stereo to 7.1/5.1 channel applications. Specification: Item Type: USB Sound Card Material: Aluminum Alloy Support: AES/EBU, IEC60958, S/PDIF Sound Channel: Supports 5.1 Channel and 7.1 Channel. Can be connected to 5.1 Speakers Sampling Rate: Up to 48KHz Sampling Rate, Support 32KHz/44KHz/48KHz Digital Recording Function Interface: SPDIF OUT, SPDIF IN, CEN/BASSOUT, REAR OUT, FRONT OUT, LINE IN, MIC IN Optical Output: The Sound Card Optical Output Only Supports 488KHz Sampling Rate, so the DTS CD is 44KH and needs to be converted to listen to it. Compatible Systems: Support for Win98/ME/2000, for WIN 7, for WIN 8, for WIN 10, for OS X 9.1 (for OS X only 2 channels can be used) Full Duplex Sound: Play and Record Full Duplex Sound Streams Without a Built in PC Sound Card USB: USB 2.0 Backwards Compatible with USB 1.1 Sound Device Specification: Compatible with Sound Device Specification V1.0 Transfer Speed: Supports USB Full Speed transfer specification up to 12Mbps. Package List: 1 x USB Sound Card1 x Driver Disk Note: Special Note: The sound card's Mix and Reverb functions cannot be used at the same time If you want the optical output to support 5.1 channel output, the following conditions must be met:1. The sound source must be DTS 5.1 channel, such as 3D games or HD movies if it is a regular MP3 or regular 2 channel movie, it can only have 2 channel effect2. Player settings are very important: if you are using the for PowerDVD software, you can set the optical "pass through" setting.If you use for PowerDVD software to set the optical "pass through" output, it means that the sound card is only responsible for outputting the optical signal without decoding. It is recommended to use KMP player, which has very powerful functions.3. After the optical output, it must be connected to an AC3/DTS decoder or a power amplifier with built in AC3/DTS decoding.