Just remember that in both the US and the EU this is only an unlicensed band if you stay below very specific power transmission levels. And these days almost all zwave devices transmit at maximum power. If you can’t use a regular Z wave repeater in the location, you may need to get a license to use a more powerful device. This is because the signal can interfere with other devices in the area, including systems that your neighbors may have or even ambulance or first responder communication devices.