When an alarm or abnormal condition occurs, the communicator sends a coded signal to special receivers at a 24-hour central station to alert station operators to call the appropriate authorities and the building’s management or owners .12 Ağu 2016
When an alarm or abnormal condition occurs, the communicator sends a coded signal to special receivers at a 24-hour central station to alert station operators to call the appropriate authorities and the building’s management or owners .12 Ağu 2016