Gs Fit is a health app that needs to be used with our watch. Main functions include health data display and smart device management assistant. Functions include heart rate, sleep time, step counting, calorie monitoring, alarm clock, sedentary time, incoming call and message reminders, etc. The heart rate, blood oxygen and other detection functions of this application are not suitable for medical purposes (the watch device used is used for measurement, the sensor model is DB1688) and are for reference only. Designed for general fitness and health purposes only.