Sonic Pro:

Once your Sonic Pro is installed and your Bridge is plugged in and switched on, you need the QR code to pair Bridge (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 manual.

Sonic Wi-Fi:

The QR code is located on the box Sonic came in, on the back of the manual, and under the shut-off valve handle.

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