The Game Boy Advance doesn't use a backlight, which can make it hard to see the screen in low-light conditions. If you are willing to take apart the GBA and use some tools, there many backlight modifications on the web that can be used to help install a backlight into your GBA. ***But you must keep note: by installing a backlight mod into the GBA, you must do it correctly, as you could cause damage to your GBA if done incorrectly. You will need some tools, and a soldering iron, for the task.***