1. The speaker hole may be blocked by a foreign object. Check it and clean it out if necessary.
2. Adjust the volume on your phone to check.
3. Press the function button on the Watch 3 Pro and go to Settings >Sounds> Volume to modify the volume settings.
4. To experience the latest firmware features, you can upgrade the firmware to the latest version in the Nothing X app. To do this, open the Nothing X app, go to the My Devices >About> Firmware update.
5. If the above steps do not resolve the issue, press the button on Watch 3 Pro to enter Settings> System Menu. Click Reset. Then, check again to see if the issue is resolved.