These docks are awesome if you have a Surface Pro that you use at home and work/school - it clicks right in to your home setup.
Originally designed for Surface Pro 3 but also worked for my Surface Pro 4 and I've heard it can be used with even newer models. Search online for how to do it.
This video did a review: www.youtube.com/watch?v=QAHMiTZNDyA
Docking Station has connections for:
. Three USB devices (2 USB 3.0, 1 2.0).
. Mini Display Port
. Gigabit Ethernet
. Audio
and charges the Surface Pro too.
(last pic added to show example of a Surface Pro in the dock)