This app uses your phone's screen to illuminate a room.it has 5 brightness modes from less to more.it incorporates a great variety of colors up to 8 different.you can choose how long the display will stay on before you fall asleep.it emits a soft and relaxing light.ideal for children and elderly people who do not know or can not turn on the light.when the app is running it is highly recommended to connect the mobile phone with its charger because the screen consumes a lot of battery.