The purpose of the red light is to provide a non-invasive and convenient way to monitor the user's heart rate. Instead of using external devices such as traditional heart rate bands, users can simply wear the bracelet to get real-time heart rate data. This is a useful feature for health-conscious users.
In addition, the red light can be used for other functions, such as oximetry monitoring. Through the reflection of the red light on the skin, the blood oxygen saturation level can be initially estimated. This is of practical value for users who need to keep an eye on blood oxygen levels, such as plateau travelers or people with cardiovascular disease.
However, it should be noted that the heart rate monitoring function of the bracelet is not a professional medical device, and its accuracy and precision may have some limitations. If you need accurate heart rate monitoring data, it is recommended that you consult a physician or use professional medical equipment for monitoring.
Overall, the red light in the middle of the Xiaomi Bracelet 8pro's main screen has a relatively minor role, and is mainly used for heart rate monitoring and initial estimation of blood oxygen saturation. It provides users with a convenient way to monitor their health, but attention needs to be paid to its accuracy and limitations.