User`s manual

Getting started
23
Option 2: Ring the rear doorbell of the existing wired doorbell and the IS7121
doorbell simultaneously.
Install the doorbell with an existing wired doorbell
If you do not connect AC power supply nor install AA batteries to
the IS7121 doorbell, only the existing wired doorbell will ring when
•
being pressed.
Follow instructions in Install the doorbell on pages 18-19 to complete 5.
View
Right
Angle
Adjustment
View
Left
Chime/buzzer of wired doorbell
Transformer
Rear Trans Front