CO2 stress management kit is designed for people who suffer from hyperventilation syndrome. It provides three main functions to help treat and prevent hyperventilation: breathing exercises, meditation, and biological and emotional data recording. The inhaler can increase the body's carbon dioxide levels and slow the breathing rate. The earphone can measure biological data through the reflective photoelectric method, predict the episode, and coach users through it. Users can also get abdominal breathing training and meditation exercises by the app.