User`s manual

12
Using another wire, slide one end of the metal part
underneath the metallic plate on the doorbell, then connect
the other end to the Trans terminal of your chime/buzzer unit
of the wired doorbell.
4.
Option 1: Ring the front doorbell of the existing wired
doorbell and the IS7121 doorbell simultaneously.
View
Right
Angle
Adjustment
View
Left
Chime/buzzer of
wired doorbell
Transformer
Rear Trans Front
View
Right
Angle
Adjustment
View
Left
Option 2: Ring the rear doorbell of the existing wired doorbell
and the IS7121 doorbell simultaneously.
Follow instructions in Install the doorbell section to complete
the installation.
5.
If you do not connect domestic power supply nor
install AA batteries to the IS741 doorbell, only the
existing wired doorbell will ring when being pressed.
View
Right
Angle
Adjustment
View
Left
Rear Trans Front
Transformer
Chime/buzzer of
wired doorbell
Transformer
View
Right
Angle
Adjustment
View
Left