As you can see in the picture, this pump is quite small, the marker pen is for comparison and not included )
Runs from about 3v and max about 6v. At 3v the water flow is pretty slow and weak, at 6v it’s quite good.
Note that this is a submersible pump, it won't self-prime, it needs to be in a couple cm of water minimally to get it pumping, and once running needs probably 5mm of water to cover the inlet.
