ZadroTwo Sided Dual Arm Wall Mount Mirror, Satin Nickel, 5X-1X

According to another website, this model (ovw45) extends up to 18" from the wall. what is the real number?

Does it have to be wired by an electrician, or can I just plug it in?

what is the diameter of the mirror?

What is the model #? Is it the same as model # OVW45? Do you still like it?