PLANET NVR-420 - Manual (Page 26)

4.2.7 Taking a Snapshot of a Live Video
To take a snapshot of a live video, right-click on the video and select
"Take Snapshot". You are given with options to take 1 snapshot or 3
continuous snapshots.
A new window should display and load the snapshot image.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420