Feature: 1. Wide Application: This USB sound card adapter is designed for 3.5mm jacks and virtual 7.1 channel devices, such as headphones, headsets or microphones, to address issues of stop working or input and output interruptions. 2. Mute Button: This USB external stereo sound card is designed with mute button and volume control roller, which allows you to control easily without unplugging anything manually from the computer. 3. Mixer function: This external stereo sound card adapter supports mixer function that can adjust the output electronically level. Functional keys including microphone mute, and volume up/down roller. 4. 3 Jacks: This stereo sound card converter is equipped with two headset jacks with one microphone jack, which can satisfy all your needs for an usb external sound card adapter. 5. Plug and Play: This 7.1 channel external sound adapter is suitable for Win, for OS X Laptop operating system, plug and play. Small size and light weight ensure portability. Specification: Item Type: USB Sound Card Adapter Material: ABS Sampling Rate: 44.1K, 48K, 96K Function: Virtual 7.1 Channel Compatible System: Suitable for Win, for OS X Laptop. Package List: 1 x USB Sound Card Adapter1 x User Manual