Amazfit GTR 2e Benutzerhandbuch Seite 55

 Heart rate range alert
If your heart rate is out of the predefined heart rate range when you are working out,
the watch vibrates to notify you that your heart rate is too high or too low and displays
your current heart rate. Before you use the heart rate range alert feature, go to the
Workout Settings screen to turn on Heart Rate Range Alert.
 Pace too slow alert
If your real-time pace is lower than the predefined value when you are working out, the
watch vibrates to notify you that your pace is too low and displays your current pace.
Before you use the Pace too slow alert feature, go to the Workout Settings screen to turn
on Pace Alert.