AGI Security SYS-4HNVR304 Manual - Manual (Page 8)

HARDWARE OVERVIEW
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8) Video Input (w/PoE) (for selected models only)
They are used to connect IP cameras locally. This device supports PoE (power-over-ethernet), which could
provide power to all connected cameras. No power adapters are needed for cameras.
9) EXTERNAL I/O (for selected models only)
Insert the supplied external I/O block, and users are able to connect external devices.
10) USB3.0 (for selected models only)
This port could be used when you want to copy large video data from the recorder. The data transfer will be
faster.