AcuRite75159M 14.5" Large White LED Digital Clock Inch

Does this clock do time in 24 hour format?

Does this clock have a dimmer for night time? I want to use it in a bedroom, and don't want it to light up the room.

Does this clock gain or lose time?

What are the dimensions of the power adapter? The wall outlet is recessed about an inch into the wall and I want to know if the plug will fit or bulge