If the heart rate is not valued on your watch, there are several reasons for this issue:
1. Dirt, sweat, or skin oils can affect the heart rate sensor's ability to detect your heart rate. Please keep the sensor clean;
2. The watch is not snugly fitting on your wrist. To get an accurate heart rate reading, the sensor should be in close contact with your skin. please try to adjust the tightness of the watch to measure again;
3. If the heart rate lamp is not on, please try to press and hold the power button for more than 15 seconds to restart the watch.