Individual video indoor unit for setting up a video door-intercom system. You can choose between 1 to 6 family outdoor units from the VDV series. This door-intercom system impresses with its sophisticated, ultra thin design and excellent voice quality. The system is based on up to 4 outdoor and 4 indoor units can be extended. Regardless of the number of individual components you need for the power supply of the entire door just a power supply, either to a indoor or outdoor units can be connected. Alternatively speak with handset or via the hands-free function. When using the handset, the connection is automatically removed/hanging up the receiver made or completed (as with the phone). Up to 4 outdoor stations or cameras can be retrieved individually. Connection for floors doorbell button with its own ring tone to differentiate between the doors. Connection for the integration of the radio module mod. VTX-bell (Order No. 55 24 71) for the integration of wireless door bell system Bell 20