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 Z-Stick Gen5 from Aeotec
USB based Z-Wave antenna used to build a gateway with open-source software.
This is the 2020 upgraded model from Aeotec featuring compatibility with Raspberry Pi 4. Older models of ZW090 do not offer Raspberry Pi 4 compatibility. Do note, however, that it is not Aeotec's Z-Stick Gen5 Plus model which remains unavailable to distributors and partners.
Aeotec maintains Z-Stick Gen5 user guide and setup information at that link.