A:AnswerWindows will allow you to drop down the native resolution of the monitor to others which also have the same resolution ratio. The monitor has ports for the power adapter, HDMI, DisplayPort, DVI, and Headphone out.
A:AnswerThere are two different models, the cheaper version does not have the LED built in. Go to Amazon and pick up some $10 LED strips and you can solve that little problem! Otherwise the one attached has the LEDs
A:AnswerTLDR: no wall mount in the box but the ability to use a mount with it
from the factory it has 4 machine screws in the back where the base mounts from, you take those screws out you put in the standoffs (picture below) from there it's a standard VESA mount which you can use to attach to pretty much any monitor stand or mount.
A:AnswerYes it is possible to use the monitor with an Xbox One, however many of the benefits of the monitor would not be available to you as the Xbox One hardware is limited in performance compared to a gaming PC.