For Windows systems:1. If you only want to listen to the audio on the computer, select "soundcore Sport X20 Stereo" for the computer audio. If you need to adjust the volume, adjust both the software and the computer volume. 2. If you need to use a conference app on your computer such as Zoom/Microsoft Teams, please set the input and output of the software as stated below: - Microphone on the Conference Software: soundcore Sport X20 Hands-Free- Speaker on the Conference Software: soundcore Sport X20 Hands-FreeIf you need to adjust the volume, please do so through the software. If you cannot adjust the volume via the software, please select soundcore Sport X20 Hands-Free as the output on your computer and adjust the volume.3. If you need to use an audio and video app on the computer and you cannot set the input and output via the app, please open the computer audio settings and choose the correct settings:Input: soundcore Sport X20 Hands-FreeOutput: soundcore Sport X20 Hands-FreeFor iOS systems:Set both input and output as soundcore Sport X20.