Which frequency version to order
Z-Wave products use a different wireless frequency globally. See 'Z-Wave frequencies' for detailed information on which frequencies have been legally approved for use in different countries.
About Smart Switch 7 (EU model) (ZW175) from Aeotec
Z-Wave's smallest and safest smart plug for the EU for wireless automation and energy metering.
Aeotec maintains Smart Switch 7 user guide and setup information at that link.