User`s manual

Getting started
21
Option 2: Ring the rear doorbell of the existing wired doorbell and the IS7121
doorbell simultaneously.
Installing the doorbell with an existing wired doorbell
If you do not connect domestic power supply nor install AA batteries to
the IS7121 doorbell, only the existing wired doorbell will ring when being
pressed.
•
Follow Step 6 to Step 7 in Doorbell installation on page 17 to complete
the installation.
5.
View
Right
Angle
Adjustment
View
Left
Chime/buzzer of wired doorbell
Transformer
Rear Trans Front