To connect the Redmi Watch 5 Active (49 mm) to the Xiaomi Redmi 12C, follow these steps:
1. Install the Mi Fitness app from the Play Store on your phone.
2. Turn on the watch and enable Bluetooth on the Redmi 12C.
3. Open the Mi Fitness app, create or log in to your Xiaomi account (you can use Google or a phone number).
4. Select "Add device" in the app and choose "Redmi Watch 5 Active" from the list.
5. Confirm the pairing code on both the watch and the phone.
6. Allow the required authorisations (e.g. access to notifications) in the phone settings.

If the watch is not detected, restart both devices and repeat the procedure. To customise notifications, go to the 'Notification Settings' section in the Mi Fitness app after the connection.

*Compatibility confirmed:* The Redmi Watch 5 Active works with Android 6.0 or higher, including the Redmi 12C[^1^] system.

[^1^]: Internal data indicates compatibility with Android and iOS. The Redmi 12C uses Android, so the connection is supported.