Other than preventing the residents who have dementia are leaving the care home, the system can also provide their real-time location. Therefore, it could also prevent them to enter the restricted areas and allow the staff to monitor the residents easier. While for the other residents, the system could support a wearable emergency button. When they ask for assistance, the staff could locate them in the system. Moreover, the system has a value-added feature that it could retrieve the health data automatically from vital sign measurement devices such as BP, SpO2 meters and smart wristband/watch within the coverage areas.