Compatible model:
Compatible device: HA-DB-35
Compatible power:AC16V-24V. DC 12V
Compatible scenario:
Change existing mechanical button with the doorbell and try to use WIFI chime
Caution
If you have power connect to the doorbell directly, you don't have to use the following way to connect
Follow the steps below to change the mechanical chime to WIFI chime
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Check the wire on the house mechanical doorbell, normally they are wiring as follows.

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Short the wire together like the following picture.

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The short complete.