Please watch the teach video to know how to use it. This application is used for screen light, breath light, atmosphere light and screen flashlight. Screen Light + Breath Light ( Let this application help to sleep ) Screen Light : Any color used for sleep light. Bright Light : Breath follow the light and shade, help you easy to sleep. If you have insomnia problem and can not easy to sleep, maybe this application can help you. Try to breath follow the light and shade, reduce your tension and