1 phone mode or intercom mode, 2 single or multiple systems, 3 system attention number – DoorKing 1812 Plus User Manual

Page 25: 4 single or double ring

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1 phone mode or intercom mode, 2 single or multiple systems, 3 system attention number | 4 single or double ring | DoorKing 1812 Plus User Manual | Page 25 / 50