PLANET NVR-420 - Manual (Page 66)

‹ Define which system events should trigger the recorder to send out
notifications
‹ Define how the notifications will be sent and where they will be sent to.
* Event trigger may not work for cameras that are placed outside of your local
network or on the Internet until the UPnP Port Forwarding” is enabled in both
the NVR and the router.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420