Attention!
You can play back audio in mp4 format only.
To listen to a camera's microphone, click the 
button in the camera window.
Note
Audio playback in web browsers is supported in Windows 8 and higher OS versions.
After you complete this action, a volume slider appears.
Note
You cannot play back audio from multiple cameras simultaneously.
The higher is the slider position, the higher is the volume.
To mute audio, click the 
button.