1. [Support Type] Audio equipment supporting ordinary audio headset, microphone and 3.5mm interface 2. [Meet Demand] Multi interface and multi mode design to meet your requirements in different scenarios 3. [Good Performance] Plug and play, which can replace the traditional sound card of computer and notebook. [Scope of Application] Suitable for , for , for , for Linux, PC laptop desktop and other devices 4. [Many Functions] Support multiple EQ sound conversion. Easy to use, no external power supply, plug and play, no driver required 5. USB C Function: Computer USB2.0 Input, Connected to Desktop or Notebook USB Interface. EQ Key: Short to Switch Between Three Kinds of Sound Effects (Default Sound Effect; Effect; Movie Sound Effect) Item Type:USB Extenrnal Sound Card Model:AM-U004 Headphone Hole:Connect Stereo Headphones Headset with Microphone:Connect Headset with Microphone Microphone Connector:Connect Wired Microphone 3 x USB:3 USB Hub Interfaces (when the USB Interface is Connected to the Headset, the Microphone and EQ Have No Effect) FL FR:Stereo Output Mode Coaxial:Coaxial Audio Output, Connected to the Power Amplifier with Coaxial Interface For Toslink: Optical Fiber Audio Output, Connected to the Power Amplifier with Optical Fiber Interface Volume: Analog Audio Volume Adjustment (Increase Clockwise and Decrease Counterclockwise) Compatible System: For , for , for Linux and Other Systems How to Use: 1. Plug and play without driver 2. The audio output from the three audio output interfaces of headset + headset with microphone + FR FL is parallel output. It is recommended to connect only one of them. If connected at the same time, the sound quality be affected 3. EQ and microphone (microphone mute) function only works on the analog audio output of the machine and the microphone input. Do not connect another sound card through the hub interface 4. Vol