Why can't find the blood pressure function on the Xiaomi Smart Band 9, but can see it in the Mi Fitness APP?

The Xiaomi Smart Band 9 does not support blood pressure measurement. However, after connecting to the Mi Fitness APP, you can enter the [Blood pressure] section and add data manually. For example, you can use a professional blood pressure monitor to measure your blood pressure and then record and analyze the data, or set reminders using the APP.
To add blood pressure data manually, please refer to the following steps:
1. Connect the Xiaomi Smart Band 9 to the Mi Fitness APP;
2. Tap [Blood pressure] on the Health interface;
3. Tap the three-dot icon on the upper right corner;
4. You can add data or set reminders as your preference.