Hongdian H3304 4CH Dual SD MDVR - Manual (Page 54)

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4.6.5 ICMP
“ICMP” means Internet Control Message Protocol, used to check network availability, this function
could used to avoid fake connection.
4.7 Alarm
4.7.1 Video Alarm
“Video Alarm”: when pre-set incident triggered MDVR, react will be done. There are four kind of
reactor: I/O output, snapshot, record, pre-set position.
You could add at most 16 alarms, after add succeed, you could edit or delete it. More details please
check below: