It's not a very compact model :
Okay, You got me. It's a treadmill and it's not the best solution as a travel winder.
But it seems to be quite a fast way to wind a watch. At least an IWC.

It amazed me that a 30' run is enough to charge a BP-movement from a power reserve of two days to full.

Imagine how much time I will save on watch winding as soon as my condition gets better... ;-)