I think you’re sitting on the switch

There’s a switch marked 115 / 230 on the back of your desktop computer. What does this switch do?

A) Configures over-clocking parameters for the CPU

B) Modifies the input voltage for the power supply

C) Sets the video card refresh rate

D) Moves the USB output between bus 115 and bus 230

E) I’m not sure, but my garage door keeps going up and down