The built-in Bluetooth Integration app allows you to add compatible BLE (Bluetooth Low Energy) devices to your hub. This integration requires hub model C-8 Pro.

You may also see a suggestion to add the Bluetooth Integration app on the home page if compatible devices are detected in range of the hub. Adding the app either way will produce the same results.
The main page of the app will list discovered devices and add them to your hub if selected, following the prompts. (Compatible Bluetooth devices must be added via this integration app, not from the Add Device page.)
If you see No devices found, ensure the devices are within range of your hub, and try waiting a few minutes, depending on the activity of your devices (the app listens for compatible device packets and can only "see" within Bluetooth range).
Only select Bluetooth devices are compatible with this integration. At the moment, the integration supports BTHome V2 format devices, with popular off-the-shelf products including most Shelly Bluetooth devices but also many DIY devices (although as with any device, a compatible driver is required; see the List of Compatible Devices for built-in options). Additional device types will be explored for future platform versions.