Dahua VTH5221 series, Руководство пользователя

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Product Structure 7
Icon Name Description
SOS Press this key to call the Call Center in case of emergency.
Menu Press this key to return to main menu.
Call
In case of incoming call, press this key to answer the 
call.
During talk, press this key to hang up. 
During monitoring, press this key to speak to apartment

VTO, villa VTO and fence station.
During speaking, press this key to exit speaking. 
Monitor
In standby mode, press this key to monitor the main

VTO.
During monitoring, press this key to exit monitoring. 
Unlock
Press this key during calling, talking, monitoring and
speaking of VTO, so corresponding VTO will be unlocked.
Table 2-6
2.1.5 VTH1660CH
Figure 2-7
No. Name Description
1 Power indicator
If this indicator turns on in green, it represents
normal power supply.
2 Microphone Audio input.