Be aware if buying Duet Wifi to be sent to Brazil
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Our telecommunications agency, ANATEL, is now charging a very expensive tax for any radio emission device bought abroad. The Wifi module needs to be certified by the agency.
I am sure that ESP8266 is so there should be a way to work around this limitation.
I found this but I am not sure how to use it with Duet Wifi: https://fccid.io/ANATEL/04628-16-10018
This seems to be the certification: https://sistemas.anatel.gov.br/sgch/HistoricoCertificado/Homologacao.asp?NumRFGCT=1022217&idtHistoricoCert=10494805
But until that I would recommend for anyone buying from Brazil to choose the Ethernet version.