Hi @user64656. There should be a terminal for the transformer, typically labeled as trans. The Pro Power Kit should be installed on the front and trans terminals, assuming your Doorbell Pro is installed at the front door. We also have installation instructions for the Pro Power Kit [here](https://support.ring.com/hc/en-us/articles/115005974286-How-to-Install-Pro-Power-Kit-V2-for-Ring-Video-Doorbell-Pro).

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