Bairefu tracks the activities of the elderly in real time through wireless sensors in the home, allowing family members to remotely monitor the activities while protecting the privacy of the elderly. The system monitors the daily activities of the elderly 24 hours a day, establishes personalized activity files, and can call for help through the SOS button with one click in case of emergency. If an abnormality such as prolonged inactivity is detected, a push notification will be sent to the caregiver immediately. Families can view activity charts, set warning rules, and integrate Google Fit data (such as step count, calorie consumption, etc.) through the App to fully understand their health status.