It's a basic 4U rack case, it has deattachable lids on both sides with standard but kinda small and low quality butterfly latches. One lid has a little bag made out of a net like material where you can throw few things, both lids are moderately deep so you can have an adapter or cables sticking out of panel of your device and still close them, you can screw devices from both sides so you can actually fit more than 4 devices in theory (if they are short enough and if you can somehow manage cable in there and still have some airflow to cool them, but preferably you want 4 devices in front and use other side to mount smaller ones like a wireless receiver and/or power strip) Other than butterfly latches it's build is decent, it could use more comfortable handles (they could be covered in some rubber like material and a little bit wider and longer). Overall - a really affordable and a well made case, if Thomann wants to make a new version I would suggest to add wheels, an retractable handle and improve latches, then it would be perfect :)