Dahua Technology Mobile Phone Monitor - Manual (Page 14)

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Volume control of video
Single touch to start a bidirectional talk with selected window. Long press to
select a single device from device list.
Create snapshot of selected window(view in local file)
Locally record selected window (view in local file)
Open device list
3.3.2 PTZ Control
Figure 3- 14
PTZ menu key can control channels with PTZ function under monitoring. See Figure 3-14.