Smart watches and fitness bracelets are products developed during the period of smart wearable devices. The era of smart wearable devices refers to the period when people pay more attention to health and fitness in recent years, and technology and health are combined. As representatives of smart wearable devices, smart watches and fitness bracelets can monitor users' health indicators such as heart rate, steps and sleep quality in real time through built-in sensors and intelligent algorithms, record users' exercise data, and provide corresponding analysis and suggestions. These devices also have many convenient functions, such as message notification, music control and payment functions.