 This is useful for individual homes / apartments / bungalows /
offices where the entry point is far away from the main living area.
The unit provides the facility for a two-way audio communication between the visitor at
the door and those inside and the facility of remote operation (unlocking) of the door
from inside. In the basic configuration, the unit consists of a two way intercom. The base
unit is kept inside home and a hands-free set at the entry point. The entry door lock is
replaced (or additionally supported) with an electric lock which is locked / released
through an electric switch located at a convenient location, normally with the base unit.
When the visitor presses the door bell, conversation with the visitor can be had through
the intercom from inside. If the visitor is to be allowed entry then the door lock can be
opened with the electric switch from within the house.
It is possible to buy the intercom & electric lock individually, though most of units
are integrated. The electrically operated door locking system can be used to open the door
remotely. The electric locks come with a battery backup protection also, just in case
there is a power failure. Otherwise these locks can be manually operated also. The
installation is simple and requires couple of wires to be run from main door to the base
unit.
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