Inside we finde 2 Ram slots a 2.5" STATA disc bay with screw less mounting and a PCIE (?) slot for WiFi. 

I recommend buying one with WiFi included since there are no antennas otherwise. 

The other side of the board features the CPU power supply , 1x -  M.2 slot (presumably), 1x STATA for an optical drive and a header with 5V I used to power the Display (red/black wire) 

Unfortunately no Molex connector (but you can remove the nose from the connector to make it fit (2.54mm) .

There is also an connector labeled DC-IN maybe for direct 12V power input?