In this project, we focus on the elderly who are facing loneliness problems because of senile diseases or mobility limitations. we design a service system, including an interactive device and an application, for adults above 65 years old with mobility limitations. The system works in a retirement community that tries to solve lonely problems. We focus on two high-risk diseases of the elderly- MCI and stroke. I design an interactive device, an App, and a service flow to provide a guideline to our service system. Impact by Covid-19, I cannot test the prototypes in person. I will do it later and refine the product based on the users’ feedback.