I know it is not the seller fault. I needed a switch 110V. I bought EU standard because it was square panel rather than the US rectangular panel. However the EU standard is 220V while the US is 110V. I suggest to add in the front of the ad the note that the EU std is 220 V rather than 110V, although in the item description the 220 V is clear. My fault, I will bear the cost of the mistake and buy another one US Std.