I got this to specifically use on a plane or train ride. This is extremely well made. It feels heavy and very sturdy in the hand. The clamping action is spring loaded. You push down on the angled inner button to separate the clamping surfaces. This folds down into a small size yet, when opened up is large enough to do it's job. Because of how rigid it is, and how tightly it clamps, I could see this loaded with a smart phone and clamped onto a airplane seat tray, and the thing would perform well even in turbulence. I can't wait til my next flight to try this out.
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