,,Apartment door status detector externally 'status interrogation apartment door with an external alarm station

摘要

"Apartment door status detector externally " status interrogation apartment door with an external alarm station characterized in that the ‘ apartment door status detector externally " of at least one push button (pos. 1) or switch (pos. 1) in conjunction with an external alarm station (pos. 2) and in the opening of an apartment door (pos. 3), adjacent to, on or in which it is mounted, a random information request instruction.