For this smart device, we aim to design a wearable device for senior users who need health care. We design three functions that are useful for senior citizens, including tumble detection, environment monitoring and chat box. Most of the goals we set in the proposal are achieved. We use AWS to set up the data base and machine learning model to address the tumble detection and environment detection problem. In our project, we use various tools we learned in the class and the lab (data collection, data preprocessing, cloud data base, machine learning etc.). By using this project, senior people can be perfectly taken care of and monitored. Whenever the road situation is bad, warnings raise; whenever they still fall with warnings, messages with all useful information is sent to their relatives or police. If nothing happens, which is the best case, they can still get accompanied by the chat box in this project.