PLANET NVR-420 - Manual (Page 85)

"ENTER" button on the remote control to start recording right away.
You should see an on-screen text notification indicating the recording has been
started.
Alternatively, you can press the "REC"
button on the remote control to start
recording the current viewing channel
right away. Press it again to stop.
7.3 Taking Snapshot
Before taking a snapshot of the live video, please make sure a FAT32 formatted
USB drive is plugged into the NVR. If you have "Manual recording" icon selected,
press the "Down" button on the remote control to select the "Snapshot" icon.
Press the "ENTER" button on the remote control to take a snapshot.
You should see an on-screen text notification indicating that a snapshot of the
video has been taken.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420