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The Microsoft Display Dock was released to support Continuum which is Microsoft's technology for allowing Microsoft phones like the Lumia 950 to create a Windows PC experience over USB Type-C.

The Display Dock packaging is a lot like the Lumia 950's packaging.

The Display Dock comes with accessories including USB Type-C AC Adapter and USB Type-C to USB Type-C cable.

The Microsoft Display Dock has one USB Type-C and three USB Type-A downstream ports running at USB 3.1 Gen 1 (5 Gb/s) speeds.  There is also one DisplayPort 1.2 port and one HDMI 1.4 port, either of which you can use to connect to an external monitor.

On the other side of the Display Dock is the USB Type-C port to connect to the Lumia 950 over the USB Type-C to USB Type-C cable.

Once the Display Dock is attached to the Lumia 950, you can connect to an HDMI or a DisplayPort monitor. This connection then enables Continuum.  You can also attach USB mouse, keyboards, and storage devices to the Dock, to recreate the Windows PC experience from your phone.