PLANET NVR-420 - Manual (Page 80)

"ENTER" button on the remote control to start sequence viewing between all
available channels with default 5-second interval. Press the "ENTER" button on
the remote control again to stop it.
When the focus is on the "Start/stop sequence viewing" icon, press the "Right"
button on the remote to move the focus to the sequence interval drop-down
menu.
Press the "ENTER" button on the remote to display all options in the drop-down
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420