I have heard these could be wired for 120 volts or 240 volts.
I don't know if I'd want an outlet that might be either 120V or 240V. The slots are such that a 120V 2 prong plug would fit. Most 120V loads will not like 240V at all :-( Depending on how it blows up, it could be a hazard to the user. Even if no injury occurs, he's gonna be real unhappy if the load is something more expensive than a light bulb and it got smoked....
Outlets and plugs are supposed to not be able to be mated if the voltage and current ratings are not compatable.
