For Windows system computer:1. If you only want to listen to the audio on the computer, select "soundcore Liberty 4 NC 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 Liberty 4 NC Hands-Free- Speaker on the conference app: soundcore Liberty 4 NC Hands-FreeIf you need to adjust the volume, please do so on the app. If you cannot adjust the volume on the app, please select the Soundcore Liberty 4 NC Hands-Free as 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 on the app, please open the computer audio settings and choose the correct settings:Input: soundcore Liberty 4 NC Hands-FreeOutput: soundcore Liberty 4 NC Hands-FreeFor iOS system computer: Set both input and output as soundcore Liberty 4 NC.