Yeah, the thing is they aren't as effective as you would hope. Its a cool idea, but its 1) kinda tough to do when its not built into the car 2) looks a little ugly to have the unit sitting on top of the dash. 3) fades with bright sunlight.
Also you have to get the angle right and lock in the position which is kinda hard.
Maybe if you tell us what its going to be used for we can help you out better.
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