The smartphone's screen lights up
By pressing Flic, the screen lights up to a colour of your choice. When the room is dark and you don't need the lights on (for example you have to pee during sleep and the lights would burn your eyes!), you press Flic, the screen lights up, you have the minimum light so you can find your way through the room and not fall on the walls.
I know I would definitely use my Flic for this purpose!