This is a Very interesting and unusual application that the developer should put you in a state of relaxation using a variety of light and sound signals. This device is also called brain machine, and the name she had it. The point is, you have to plug the headphones and start the app. It will give out sounds, and a flickering circles on the screen, sending signals to your brain, they relax it. Also, there are settings so everyone was able to change all that he needed, its parameters. This app is strongly not recommended for epileptics and people with heart disease.