Hello Mark Ditzler,
Thanks for writing in.
Would you please firstly let us know which switching poewr supply you mean?
Please kindly send us the product link or ASIN number for confirmation?
Best regards.
It is the AC110/220V Switching Power Supply. SKU:2001712002.
The notes say default is 220V. I plan to use 110V. There is a yellow label on top of the unit That says: 110/220V is selected by switch. Where is the switch located??
Dear Mark Ditzler,
As the following picture showed, the switch is on the circuit board. You can use screwdriver to toggle switch without open the case
Best regards.