Is the Mi Smart Band 4C heart rate sensor accurate? - Quora
Calorie burn is way off during workouts on Miband 4. I got 732 vs 590 calories burned (1 hour biking indoors). Puls is very accurate vs 120$ pulseband. : r/miband
Mi Band 4 Heart Rate Monitor Review | How accurate is the Heart-rate monitor in Mi Band 4? - YouTube
Xiaomi Mi Band 4 Review | Tested by GearLab
Use Xiaomi Mi Band as a continuous heart rate monitor with Google Fit | Ctrl blog