Speco Technologies 2 Channel HDcctv + 8 Channel Full D1 Digital Video Recorder DVR82HD - Manual (Page 65)

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To display the recorded data of selected channel or all channels on a
time line scale.
To change a timeline scale from 24 hours to 60 minutes.
The timeline shows recorded data in color on the bar. You can adjust
the timeline scale and move it to the time you wish to playback. Then
click the play icon to display the recorded video.
Playback buttons.
Digital Zoom Window in Live and Playback. (Only available in Single
Channel Viewing)