Asus BP5120 - Manual (Page 17)

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Selecting the voltage
The system’s power supply unit has a 115V / 230V voltage selector switch located
below the power connector. Use this switch to select the appropriate system input
voltage according to the voltage supply in your area.
If the voltage supply in your area is 100-127V, set the switch to 115V.
If the voltage supply in your area is 200-240V, set the swith to 230V.
Setting the switch to 115V in a 230V environment will seriously damage the
system!