This tool can generate binaural beats from a specific frequency, in order to stimulate specific parts of the brain. It can also generate pink noise and brown noise. It is a great app to relax, and it has a built-in collection of beautiful sounds to do that. It is useful to have in your smartphone, especially if you have problems with your sleeping time.

If you want to use it with your Android, just download the app, set the frequency, press the play button and select one of the presets. If you want to change the settings, you can do that by pressing the menu button and then the settings button. It is very easy to use, and you don't need any special knowledge to use it.