For your reference, please check the following methods:
1. Check if there is a green light blinking when the back of the band touches the skin. A blinking green light indicates that the heart rate monitoring function of the band is on properly. If there is no green light flashing, please check if the heart rate monitoring function is turned on correctly;
2. Please wear the band in the correct way (the wrist strap should not be too loose). It is recommended to adjust the wearing status and check the heart rate function again;
3. Dry skin and skin scars can affect the heart rate measurement results. In addition, cold winter temperatures can also affect the heart rate measurement results;
4. If there is no above problem, please restart the band, change the arm you wear, and try again.