Electronic devices such as, for example, computers (PCs), laptop computers, personal digital assistants (PDAs) and the like may include, or be connected to, one or more power supplies. Among other functions, a power supply may convert alternating current (AC) power to direct current (DC) power at a voltage level for which the circuitry of the electronic device is designed.
AC power is transmitted through commercial power grids at high voltages and transformed to lower voltage, typically 115V or 230V, to power outlets. Power supplies may include a device that can transform power from a power source at 115V, 230V, or other voltages to DC power at a voltage suitable for an electronic device. A power supply that is set to an incorrect input voltage level may cause the electronic device to fail, or to operate improperly. Therefore, an indicator of the power supply voltage setting is useful.