These fans require 12VDC supply. I can't find a spec for their current draw, but typically one of these might use at max 1 amp for starting current, and less while running. So for four connected in parallel to one 12VDC supply, the supply should be able to provide 4 amps or so max. Wiring code of the fan wires is: Black to Negative, Red to Positive of the supply. Do not connect anything to the fans' yellow wires - they are pulse output signals for speed measurment you are not going to be doing.