If you have ever been annoyed at how long your capacitive button lights stay on or annoyed that the lights keep going off too fast, the Galaxy Button Lights app is what you need. This app gives you control over how long the backlights on those buttons stay on.
The app will work for the Galaxy S6 and S6 Edge and lets you control lights behind the recent apps and back arrow buttons. With the app installed the user can choose the time duration for lights to stay on, turn the lights on when the screen is on, or make the lights always off.
The app might function for other Samsung devices as well, but has only been tested to work on the new S6 devices. The app does need permission to write system settings. The app was recently updated to version 1.2 and added a display that users see if a device isn’t compatible.
The update landed April 20 and the app is a small 17kb in size. So far it has been installed as many as 5,000 times and requires Android 5.0 or higher to work.
SOURCE: Google Play