Very good quality headset. Very comfortable. 
Retractable boom mic (can be pushed into earcup) 
Brand new ear cups (cheap ones that are still comfortable the factory ones fell apart). 
I would recommend looking at wicked cushions if after a new set. 
Few options for connectivity on the back of the GameDac (see the last picture).
No box.
No additional cables.
What you see in pictures is what it comes with.

https://steelseries.com/gaming-headsets/arctis-pro-gamedac