vincenzomarletta Just the size of the panel. Look at the specifications of the product on the SONOFF website or better on the itead websiIte. I'm using the US version in Italy with the 220 V, 50 Hz main power supply.

vincenzomarletta Hi daveho84, in the following the dimensions of the panel for the three versions: EU = 86mm x 86 mm US = 86mm x 86 mm UK = 74mm x 120 mm

vincenzomarletta The device specifics are: Input voltage: 90~ 250V AC Input current: Max 10A -15A then it is compliant with the US power line. Concerning the possibility to adapt to your wall socket you can see the dimensions on itead.cc under the category smart-home.