According to the supplier, the Epson OT-WL02 Wireless LAN Dongle variant is a 2.4 GHz model (https://www3.epson.com.hk/en...) and the other two are 2.4/5 GHz. Corresponding compatibility lists for the remaining two models can be found directly on the manufacturer's site: https://www.epson.at/de_AT... and https://www.epson.eu/en_EU.... Please note that the compatibility lists differ depending on the product. If you would like further assistance with your selection, please feel free to contact our customer service: https://helpcenter.digitec.ch/hc....