PLANET DVR-1670 - Manual (Page 4)

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Please note the usage of jumper JJ1. If you use DC, either of connections
is OK. We suggest you to use those DC under 12V, 1A.
If you use AC, please open the jumper. There are 4 jumpers (JJ1, JJ2, JJ3
and JJ4) in DVR main board, corresponding with 4 alarm output. The
default is closed.
Warning：If you use AC input for relay output, please open the jumpers.
Further Configuration
If you want to configure DVR-470/DVR-1670 and know the operation,
please refer to our manual in the CD disk.
2011-AB3480-000