VTech IS7121 Installation Manual page 14

Install the doorbell with an existing wired
doorbell (optional)
If you already have a wired doorbell installed, follow the
instructions below to install your new IS7121 doorbell unit.
1.
Turn off the power supply to the existing wired doorbell.
2. Follow instructions in Install the doorbell wall mount cover
section.
3.
Insert a cross-head screwdriver to the side of the battery
compartment on the right, then twist and lift to loosen the
screw and the metallic plate. Using a wire, slide one end of
the metal part of the wire underneath the metallic plate, then
twist the screw to secure. Connect the other end to
the transformer.
Adjustment
View
Right
Angle
View
Left
Transformer
4
Transformer