Master Room Station

Sub Room station

Door Station

Door to room

Can hear a call sound from main and sub room station at the same time when pushing the call button of the door station

At that time any room-station is possible to talk with the door station by picking up the handset

Room to Room

It will be a ringing call sound from another room station by pushing the call button of the room station.

At that time they can converse with another room station as freely.

While the line is busy with room to room conversation, each room station will hear a faint call sound from  the door station if someone push the call button.

By replacing the handset and picking it up again any of the two room stations can talk to the door station

This unit is ideal for a house  with a flat.