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 Siren Gen5 (Promotion) from Aeotec
Indoor, plug-in siren with configurable loudness up to 105dB. Also features LED trigger lights and backup battery.
Aeotec maintains Siren Gen5 user guide and setup information at that link.