I purchased this about a year ago for around 9,000 yen and have kept it stored without using it. I have never assembled it, so the parts are still unopened. It can be used with dual displays. It moves in all directions: vertical, horizontal, and diagonal. Compatible monitor size is 27 inches or less. I have lost the instructions, so they are not included, but I think it's a standard installation method, just like a regular monitor, so you should be able to install it intuitively.