VTech IS7121 Installation Manual page 16

Option 2: Ring the rear doorbell of the existing wired doorbell
Adjustment
View
Right
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.
5.
Follow instructions in Install the doorbell section to complete
the installation.
Specification are subject to change without notice.
© 203 VTECH TELECOMMUNICATIONS LTD.
All rights reserved. 2/3. IS72-X_CA_IG_V4.0
Document order number: 6-00372-040-00
and the IS7121 doorbell simultaneously.
Angle
View
Left
Rear
Trans
Chime/buzzer of
wired doorbell
6
Transformer
Transformer
Front