The unit is fully functional but has 2 small issues that you might be able to fix easily. First one is that the leftmost pot is not perfecttly smooth, you`ll notice that at around 10 o`clock it has a bit more resistance. The second issue is that the encoder cap next to the screen is too small compared to the opening. As you can see from the photos there is strong white LED light coming out which can be somewhat annoying if you are standing directly above it. Replacing it with a bigger encoder to cover the empty spots might be a good idea. Besides that the unit works fine.

I don`t know which filter it comes with, the preious owner did not know either, and of course a power supply cable is included. Feel free to reach out for any questions :)