Main functions:
1) With 2-way calling, intercom, and 2-way video functions
2) With Ding-Dong ring of mainframe and extension
3) Can surveil each other, with video output connector, we can send the video single
to monitor or computer upon your need
4) Time for intercom is fixed as 30 minutes, also can connect to "Call" button in
addition
5) Connect the mainframe and extension by 6-core single wire and 2pcs of video wire
6) Size: 285 x 200 x 50mm
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