Temperature humidity shows that it is nan! In order for the projector to work, it needs to be plugged into the socket with a 5V adapter that is not included. The downside is that when the projector is on, the backlight of the screen lights up the entire room. So I turned the projector upside down so that the screen faces the wall and stuck the clock on the wall to hide the screen, so the projector shows on the opposite wall. It is only worth buying for this case and because it consumes minimal power 1.5 - 2W.

To see the screen at night, you have to press a button. It is not user-friendly. It is good to have it as a simple watch during the day.