WILL THIS DC POWER SUPPLY WORK??????

[tukn22inch]

i found this dc power supply on ebay and its real cheep, i called them and they said it has a card (nic) and i have no idea about it, they told me on the back of it, it says " -48VDC 130A "
my question is, if i put a reostat on it will it give me the power i need please help !