Multi-user Intercom:
Intercommunication is available between indoor phones,Centralized power supply,4-wire connection.

BK-0010 Multi-user Intercom:

Intercommunication is available between indoor phones with privacy kept.Up to 10 indoor phones can be adopted.Busy line reminding.Centralized power supply.4-wire connection.Enclosed an adapter.Maximum talking distance: 300m.With group calling function.Sharp clear voice.