Go Ahead and Laugh at Me

The last thing I need to do is screw up a brand new power supply that goes to a CD transport. But the manual doesn't specifically tell me. Online hits about voltage selector switches don't specify it either.

If you push the selector in one direction it reads 230V. Push it the other way and it reads 115V. So do I want the number in the window or do I want to move the selector toward the desired voltage? I mean, geez... 🙁