You can use three colors of light or decide if you want to use the flashlight outside your phone and use it anywhere in the dark. However, since the external flashlight API of this app does not support older phones, external flashlights cannot be used on phones with Android Lollipop or lower. Please leave a variety of comments, such as errors in the app or adding app features. I am a beginner developer :) Thank you. Please use this app well.