User`s manual

5. Playback
Playback is a function that allows you to play one or more videos that were
previously recorded by a chosen recording method or due to an event
trigger. The NVR offers synchronized playback from up to 4 channels and
various types of search methods are provided to help you find the footage
you need quickly.
You can turn on or off the audio of a recorded video at your choice if audio
was also recorded during the recording of the video.
Playback video can be viewed in full screen and snapshots can be taken
and saved during a video playback.