Well, as far as I know, it simply needs a sufficiently powerful power supply unit that could also run the laptop directly. Look at the docking station to see how much power it needs, and that's what the power supply needs to deliver at least. The connections of the power supply units at Dell are standardised, except for the very new ones, whose connections have slightly smaller dimensions. I always have several power supply units for our notebooks so that I have a power supply unit everywhere at the various workstations....