Review on Multifunctional Expander Extender Rotating Adjustable by Scott Decoteau

If you can read Chinese I think it's easy to install as the printed instructions are in a foreign language. The bottom cup is too narrow for a regular sized cup to fit all the way down. If you then put a drink in the top one, it all stops being heavy and you'll have two drinks in your lap if you turn around without holding on. The bottom fit isn't as tight, which creates a nice new bang when riding. But the goods came very punctually, in good condition, well packaged. I do not recommend.