What to do if there is no sound when viewing real-time images on the Xiaomi Smart Camera C302?

If there is no sound when viewing the real-time surveillance footage of the Xiaomi Smart Camera C302, please refer to the steps to troubleshoot:
1. The volume of real-time video is turned off by default in the Xiaomi Home App. You can enable the volume in the Xiaomi Home App's video window by tapping the [Mute] icon. If the volume is low, adjust it higher on your phone.