Unfortunately, an outdated FM radio.

No, you cannot set the light duration yourself. It starts 30 minutes before the alarm time and gets pretty bright straight away. (At least that's what wakes me up. But the light alarm clock is more for people who don't wake up easily in the morning. It works very well for my children).

I have this device - and so far have not found a way to change the 30 minutes. LG

There is a button specifically for adjusting the brightness of the time display. There are 4 brightness levels and the last one is the total dimming.

Yes, this is possible. The display can be dimmed from bright to completely off in 4 steps, the light can be set to 0. If you value the radio, you should choose another product, as FM is to be gradually switched off this year. I did not know that when I bought it.