There are 2 light buttons if device shows time. Left side on top. And right side on bottom.
The function is exactly the same:
If I press the button, light turns on and turns off after some seconds.
It is also possible to turn off light by pressing the button once again.
How about a new feauture? The feature: "Show light while while pressing right button on buttom". Meaning: Just getting light WHILE pressing button.