This is what I purchased:
Antec High Current Gamer Series HCG-750 750W ATX12V Model:HCG-750
I do not believe there is a switch.
Nice PSU, they just sent you the wrong power cord.
Dbl check the manual & make sure the PSU will accomodate(most likely it does)
the voltage (from the wall) in your location. If so, then buy an adapter from
the link alexiou gave you.