Does the video recorded by Xiaomi Smart Camera C500 Pro in the home surveillance assistant, cloud storage, microSD card have sound?

The videos recorded by these forms of video recording have sound. However, if you turn on the speed playback, it will be muted by default, which is normal.
In addition, the camera surveillance screen or cloud storage, and memory card video playback interfaces are muted by default, if you need to play the sound normally, just tap the mute button to restore the sound.