Recently upgraded from the ISY994i to the EISY with the dongle. It came with two antennae marked with color coded rings. It took me some time to find out which went where so I felt if I posted it it would be easier for people to find if they had the same question. The answer I received was that yellow=Z-Wave and red=Zigbee. Other than that the upgrade was as simple as backing up the config from the ISY and restoring it to the EISY.