As the system state indicator needs a current between 8 and 24V dc or ac 50Hz, it can be installed in
parallel to the N.O. push-button which controls the door bell if this is an electromechanical bell.
In the case of electronic bells (high impedance devices), the device must be powered directly from the
secondary of the bell s transformer.
As an alternative, the system can be powered using the voltage with the above characteristics.
NOTE: the system does not work if there is no power but it maintains the state it had before power cut
and it restores it upon repowering.
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