US Smart plug works on 220v. Also, you can add it as China Smart Plug from Aqara App ( US smart plug is missing when youre in Mainland China Server) : r/Aqara
Aqara Smart Plug | På lager | Billig
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Smart Plug (US Version) User Manual - Aqara
Smart Plug (US Version) - Aqara
Smart Plug EU - Aqara
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Aqara Smart Plug (review) - Homekit News and Reviews
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Aqara Smart Plug EU | Remote Control Plug | White, SP-EUC01