StuWal, what do you mean by "what power connections"?
Both these switches support PoE, so you could connect devices that can operate on PoE.
Most common devices that I know of are WiFi access points, which sometimes installed in places without easy access to a power receptacle.
For total voltage/wattage and such, see a particular device specs.
Hope this helps, otherwise, could you expand your question.
Good luck.