【Virtual 7.1 Channel Sound】 The usb external sound card adapter is equipped with multiplexing technology. It will help realize three-dimensional positional sound and virtual 7.1 channel audio effect. Press the 7.1 CH key to start the virtual 7.1 channel audio. 【Multiple Functions】 The product acts as a audio converter/adapter which can transfer the audio information out by the usb port and collect the outside sound via microphone jack. Besides, it support headphone/microphone the same time with the 3.5mm single plug headset interface. When you need to stop the input audio, press the microphone mute button. 【Adjustable Audio Sound】 The volume of the output audio can be adjusted by the volume roller on the control panel. Adjust the appropriate sound volume according to your need without adjust the sound volume of your device. 【Wide Compatibility】 The product has wide compatibility. Required operating system, Windows 2000/ 2003/ XP, Win 798S, Linux, Mac OS, etc. It is time to replace your defect internal sound card by this sound card adapter or add a premium sound card adapter to bring you high-quality sound experience. 【Plug and Play】 Plug the adapter into your device via the usb port, it will start to work then, no extra drive needed. And its lightweight and compact feature make it be a real portable and convenient stuff. Warranty not applicable for this product