Explanation of health concepts


Stress here refers to mental stress, not including physical stress caused by high-intensity exercise. The watch quantifies stress as a stress score of 0-100, reflecting the user’s different stress levels or state of relaxation. The stress function needs to rely on continuous heart rate monitoring; if the user doesn’t enable continuous heart rate monitoring, stress data cannot be obtained.

Sleep quality

Sleep quality assessment is a result of a comprehensive assessment combining sleep time, continuity and rationality of sleep state, and sleep stability.

  • Sleep time

Human sleep has a reasonable length of time, which varies according to each person’s physical condition and sleep habits. Too much or too little sleep time will lead to a decrease in sleep quality.

  • Sleep state continuity

Refers to the continuity and switching frequency of various sleep states (deep sleep, light sleep, REM) during sleep. If the continuity of sleep is poor, various sleep states are constantly changing, and a very fragmented distribution of sleep states is displayed on the timeline, the the quality of sleep is poor.

  • Sleep state rationality

In a long period of sleep, different sleep states, especially deep sleep and REM sleep, have a reasonable range of time or duration ratios. If the proportion of deep sleep or REM sleep is too low, the quality of sleep will be affected.

  • Sleep stability

Sleep stability is an indicator for evaluating body movement during sleep such as turning over and hand movements. The more limb movements, the worse the sleep stability and the worse the corresponding sleep quality.

In the end, sleep quality is displayed with a sleep quality score of 0-100. When the sleep quality score is given, an explanation of the sleep quality will also be provided to let the user understand what affected the sleep quality for subsequent improvement.

Sleep state distribution

According to the standards of the World Health Organization, sleep is divided into three states: deep sleep, light sleep, and REM sleep. At the same time, sleep may be accompanied by short wakeful states.

  • Deep sleep

When in a deep sleep state, people have fewer body movements, sleep deeply and smoothly, breathe slowly and rhythmically, and their heart rate drops accordingly to the lowest level throughout the day. Deep sleep helps the body recover from fatigue while helping maintain a wakeful mind and strong memory. If there is a lack of deep sleep for a long time, people suffer from memory loss and an inability to concentrate.


Energy is a special feature of the watch that rarely appears in similar sports watches and smart watches. Energy evaluates the daily consumption and recovery of the user’s comprehensive body resources.

The following behaviors lead to the consumption of energy:

  • Normal daily activities;
  • Medium and high-intensity activities and workouts;
  • Enduring medium to high-intensity mental stress.

The following actions help the body recover energy:

  • Sleep;
  • Complete relaxation.

The accuracy of energy measurement depends on whether the user’s continuous daily behavior and health data can be obtained, so the user is required to wear the watch continuously.

Energy has important guiding significance for users planning and arranging their training exercises and rest plans. Because people’s subjective evaluation of their physical state is often susceptible to the environment and external stimuli they receive, it may lack accuracy. In the case of low energy, high-intensity exercise will greatly increase the chance of injury and may even lead to more serious health problems.