Choose your desired color, then click/tap on start, then follow the instructions inside the project. Pause after you have just completed a cycle if you wish.
I made this project mainly because of myself struggling with stress and want a viable way to keep track of how many I do, and have the exact timings. This breathing exercise is designed to ease your stress and whatever is bothering you. Do it a minimum of four times, or more if you wish to feel more calm.