PLANET NVR-420 - Manual (Page 91)

The NVR is able to play recorded video 1 channel at a time. To search for
playback video, select a channel from the "Channel List" first and select a search
method from the drop-down menu highlighted in the above picture.
There are three different search methods to help you locate the recorded videos.
7.8 Time Chart
Select the "Time Chart" option to display a list of years. Notice certain years are
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420