It has an attached AC power cord, but it's only about 4 feet long. You'll probably need to run an extension cord up the trunk of your tree to plug it in.
There is no switch, plug it directly into the wall outlet or to the base of the outlet with the power switch. If you hook this tree topper to a strand of blinking lights, it will not change color as the color. Plug this directly into the wall!
No you can not pick a solid color or stop the changing of colors.
Not sure, check the box