PLANET ICA-310 - Manual (Page 24)

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Power & LAN LED (green color)
This LED is used to indicate whether DC power is on or not. In addition, this LED
will be flashing while network accessing via Ethernet.
DI/DO Connector
The Camera provides a terminal block with 4 pins of connectors for DI and DO.
Please refer to the Appendix B in this manual for more information.
External Microphone
The Camera also supports external microphone. User can plug in an external
microphone to pick up voice more.