A very useful addition to a mult-cabinet setup.
The idea is to be able to easily connect between two (or more) cabinets and that works flawlessly. There are two RJ54 connectors, i.e. you can use any ethernet cable if the included one is too short (which it was for me). Please note that there are sixteen connectors but only eight are used per cable so either you use two cables between two cabinets (sixteen connectors) or you get yet another set and hook up a thrid cabinet. There is a similar solution from Intellijel and, since both use the same cable, they can interact. This is not something I have tried but I would not worry about it.
All in all and excellent solution to having too many too long patch cables once you have grown out of your first cabinet. En excellent product at an excellent price.