Features:
1) Talk back, indoor phone voluntary supervising, intercom
2) Three chord melody rings are available
3) One door station can support up to 400 indoor phones
4) Video and audio indoor phones are compatible
5) Call function: calls between monitors are available
6) With RF card reader function
7) Network application is available and you can connect to other door stations
8) When in network system, the intercom between the door station and management
unit is possible
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