Sonic Pro:

Once your Sonic Pro is installed and your Signal is plugged in and switched on, you need the QR code to pair Signal (the plug) with Sonic, and you should be able to find a QR code or a serial number printed underneath the shut-off valve handle of the Sonic itself or at the back of the installation code.

Sonic Wi-Fi:

A QR code is located on the box it came in and on the back of the manual.

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