Call Installation occurs at the moment of installation of an entrance door of the house or apartment. Choose call type (portable or stationary). The call as the device can be a component of system of restriction of access to the house or apartment. By pressing the call button there is an inclusion of a videocamera which makes record of the person facing to a door.
Such system can be in working order as in absence of the person in a protected premise and in case someone is in the house or apartment. Modern videocameras have a resource in an automatic mode to 19 records for days.
ON WHAT THE PRICE
From call type (mechanical calls are cheaper electric);
from the manufacturer (import calls are more expensive domestic);
from quantity of functions in a call, for example, quantities of melodies (the more functions, the above the price);
from "vstroennosti" in the general system of safety of the house.