Ports: 4× USB 3.0, 2× Mini DisplayPort (mDP), 1× Gigabit Ethernet (RJ‑45), 1× 3.5 mm audio output.
Dual‑monitor support: Since it has 2 mini‑DP outputs, you can connect two external monitors.
Compatibility (typical list): Many of the older Surface devices including Surface Pro 3/4, Surface Book, Surface Laptop (1st gen) etc.