Charging Dock Model#: A1668, Input 20V 4.25A max.
Charging Dock size(L*W*H): Approx. 52cm*22.5cm*5.1cm
Charging Dock Weight(NET): Approx. 2.34kg.

for more original Apple store demo try-on leather mat, pls check the below ebay listing,

 https://www.ebay.com/itm/405158158862

This retail Apple Watch display and charging stand is an OEM fixture developed and designed by Apple directly for portability in Apple stores.

To meet the demand for try-on demos in early 2015, Apple developed a mobile power station to keep several demo watches charged at once. This way, any open section of the Apple Store could become a try on station for the Apple Watch.

You need an Apple  MagSafe 2 Charging cable(Which is NOT included in this combo for sale) to power the display. This display will charge 10 Apple Watches at once, and all generations are compatible.