Installation guide

16
Option 2: Ring the rear doorbell of the existing wired doorbell
and the IS7121 doorbell simultaneously.
Follow Step 6 to Step 8 in Doorbell wall mount installation
on pages 11 and 12 to complete the installation.
5.
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.
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Distributed in Canada by VTech Technologies Canada Ltd., Richmond, B.C. V6W 1L5.
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Rear
Trans Front
Transformer
Chime/buzzer of
wired doorbell
Transformer