Xbox one Dev/Test Kit

https://www.ebay.com/itm/Microsoft-...931253?hash=item362caf78f5:g:Ra8AAOSwU-1akkqr

Im assuming this is a test kit but i saw alot of people looking for these units lately so here you go.
Also it has a box to go along with it.

 

Well the sticker on the 4th pic dose say Build DDK and it also say beta only so a beta xbox dekit? could be a pre-release xbox dev kit but I guess you wouldn't really know unless you have $700 plus to drop on it and that's the joy of buying dev hardware and other stuff like this. >__<
Lol on the subject of pre-release beta xbox dev kits I have a pre-release xbox original dev kit but it only predates the launch of the original xbox by abort a week so the beta may mean nothing knowing a bit abort how microsoft development cycles works >__<

 

Any visual difference between DevKit and TestKit of XboxOne? I think I once purchased a TestKit but I modified the Sandbox name to Retail instead of XDKS.1 and used it as Retail console. It has a stick similar to this seller's, but with Build PV-10 print on it. I assume it means PartnerVersion?

And I also know there are kits with "Build GDV","Build DDK" and "Build XXX-XXXXX"(I cannot remember the detail numbers and characters on it).I wonder what's the difference between them? Are these full devkit with performance profiling hardware that like Xbox260 devkit with sidecar attached? Or just test kit that have limited feature to run dev programs and Windows Universal Program which a general XBOX One can do nowadays with official program?