The design of the "LeXingYi" mobile app refers to the Hong Kong government's "Age-Friendly Website/Mobile Application Design Guidelines" and uses open data to provide travel information for seniors and simple users. Any icon button in the program can be long-pressed, and relevant function prompts will appear. The operation is simple, direct and convenient. The information it can display includes (1) reference to today's weather conditions from the Hong Kong Observatory, special weather reminders and weather forecasts for the next nine days, (2) estimated arrival times of buses and minibuses and six collection stations that can be quickly reviewed, (3) memorable calendar, showing Hong Kong public holidays, the 24 solar terms of the lunar calendar, international commemorative days, taboos, directions, twelve days, monthly calendars and recording personal matters, (4) Hong Kong and Shenzhen subway route maps, (5) A large square mirror and a mask are provided for easy reading of fine print and mirrors, (6) the latest Mark Six Lottery results at any time. This app does not collect or upload any data to ensure user privacy. All data entered by users is stored in their mobile phones. All data and information displayed in this program are for reference only.