You are looking at a brand new in the box -
Jabra Biz 2400 II QD Duo Headset
Part Number - 2409-820-204
Full specificarions of the headset can be seen here :-
https://www.staples.co.uk/technology/electronics/telephones/telephone-headsets/jabra-biz2400ii-duo-wired-headset-2409-820-204/