I think @Caseda 's answer is the best,
Just for the techies: look in the table here:
Normally you will only find the correct devices with local frequencies for your region.
(unless you imported another frequency device from another region, and you then have to import all Z-wave devices!)
Further I want to make the topic title clear so others searching for information will find it.
Changed from:
In which frequency homey support?
to
Z-Wave Radio frequencies and regions for Homey and Z-Wave devices
