The Xiaomi Smart Band 8 supports heart rate alerting. When the heart rate reaches the warning value in a quiet and inactive state for 10 minutes, the band will vibrate to remind you. The heart rate warning value can be set within the range of 100 beats per minute to 150 beats per minute (which can only be supported when monitoring frequency is set as smart monitoring, 1 minute or 10 minutes).
You can set heart rate warning by the following paths:
1. On the band: enter the main interface of the band >> go to the [Heart rate] APP >> [Settings] >> [High HR]/[Low HR] >> select the values.
2. On the APP: open the [Mi Fitness] APP >> [Device] >> [Heart rate] >> [Heart rate to high alert] >> select the values as your preference.